The epistemic regress problem targets our ability to provide reasons for our beliefs. If we need reasons for our beliefs, then we may also need to provide reasons for those reasons, and so on into regress. Because the epistemic regress problem is often cast as an attack on our ability to achieve justification, it is often thought that epistemic positions which do not rely on notions like justification escape without difficulty. The first goal of this dissertation is to establish the (...) generality of the epistemic regress problem, beyond all technicalities regarding the nature of justification. To do this, I propose a new minimal epistemic standard, that we should hold no bald assertions to be epistemically acceptable. I then use this epistemic standard to construct two new forms of the epistemic regress problem. The first version of the problem is reminiscent of the classical problem in that it attacks our ability to locate any such reason. The second version of the problem attacks our ability to unite any such reason to a particular claim that it is supposed to support. The second goal of this dissertation is to argue that pragmatism fails as a solution to the epistemic regress problem. The pragmatist seeks to avoid the regress by provisionally accepting their beliefs to be evaluated later. In so doing, the pragmatist seeks to have reasonable beliefs, but only after having accepted them provisionally. After eliminating other theoretical alternatives that the pragmatist may use to bolster their position, I argue that the pragmatic solution is not successful because (1) it is committed to some foundational beliefs that are necessary to facilitate the evaluation of their provisional beliefs which fall prey to the regress, and (2) the employment of these criteria of evaluation encounters the regress in its second form. I conclude by advocating for an understanding of Pyrrhonian skepticism under which we are not required to eschew our everyday beliefs that is nevertheless commensurate with the epistemic regress. (shrink)

Karl Popper rightly contests the possibility of a verification of basic statements. At the same time he strictly believes in the possibility of growth of empirical knowledge. Knowledge growth, however, is only possible if empirical theories can be falsified. This raises the question, how theories can be falsified, if a verification of those statements that falsify theories – i.e. basic statements – is not possible. This problem is often referred to as the “basic problem” or “problem of the empirical basis”. (...) In this paper I show that – from a logical point of view – a falsification of theories is possible without a verification of basic state-ments. Furthermore I show that knowledge growth in the empirical sciences will be possible if two assumptions are valid. These assumptions can neither be proven nor falsified. However, they have to be postulated by everybody in eve-ryday life. (shrink)

Amazon Book Review Series of “Wild Wise Weird”.

We suggest that the emerging field of the conservation humanities can play a valuable role in biodiversity protection in Papua New Guinea (PNG), where most land remains under collective customary clan ownership. As a first step to mobilising this scholarly field in PNG and to support capacity development for PNG humanities academics, we conducted a landscape review of PNG humanities teaching and research relating to biodiversity conservation and customary land rights. We conducted a systematic literature review, a PNG teaching programme (...) review, and a series of online workshops between the authors (10 PNG-based, 7 UK-based). We found a small but notable amount of PNG research and teaching focused on biodiversity conservation or customary land rights. This included explicit discussion of these topics in 8 of 156 PNG-authored humanities texts published 2010-2020 and related teaching content in the curricula of several different humanities-based programmes. We discuss current barriers to PNG academic development. The growth of fully fledged in-country conservation humanities will require a joint collaborative effort by PNG researchers, who are best placed to carry out such work, and researchers from abroad who can access resources to support the process. (shrink)

As the title of the article suggests, “The Burqa Ban”: Legal Precursors for Denmark, American Experiences and Experiments, and Philosophical and Critical Examinations, the authors embark on a factually investigative as well as a reflective response. More precisely, they use The 2018 Danish “Burqa Ban”: Joining a European Trend and Sending a National Message (published as a concurrent but separate article in this issue of INTERNATIONAL STUDIES JOURNAL) as a platform for further analysis and discussion of different perspectives. These include (...) case-law at the international level while focusing attention on recent rulings and judicial reasoning by the ECtHR and the ECJ; critical thought-experiments in religion, morality, human rights, and the democratic public space; a contextualized account of burqa-wearing interventions by federal and state governments and, moreover, various courts in the United States; and philosophical commentary and, in some instances, criticism of the Danish and/or European (French, etc.) approach. The different contributions have different aims. The section on case-law at the international level reports on those central judgments that, in effect, helped to pave the path for the Kingdom of Denmark’s burqa ban. Concerning the concurring judges at the ECtHR, the opinions served to uphold a preexisting ban and to grant a wide margin of appreciation to the national authorities, thereby limiting the Court’s own review. -/- As regards to the ECJ, the legality of company rules that contain a policy of neutrality for the workplace was examined, with a similar outcome. The authors who discuss religion, morality, human rights and the democratic public space are endeavoring to, respectively, appeal to ethics as a testing stone for law and to both challenge and address several forms of “expressivist worry” in connection with face veils. In doing so, the authors ask a number of thought-provoking questions that hopefully will inspire public policymakers to careful analysis. While the section that is devoted to American perspectives highlights a comprehensive survey of political and legal responses to, in particular, full-face veils like the burqa, the relevant author also incorporates public perceptions and, in the course of examining these, draws a parallel to “the fate” of the hoodie. The constitutionality of burqa-wearing in America, so it also appears, is partially an open question, but differentiating between religious, political, or personal reasons is a de jure premise. Given that the Danish legislators who drafted law L 219 to ban burqa-wearing in public places rely on a reference to political Islam, they relegate religious and personal reasons to the private domain, thereby also adopting secularism as a premise. This is explored in the last author response of the article, more precisely, in an account of the underlying materialism that, in turn, is applied to Muslim women. If policymakers and legislators engaged in Thinking Things Through exercises, they could, as a minimum, avoid law-making strategies that are not in the spirit of the theory they themselves invoke, albeit tacitly. While the aim of, as it were, arresting culturally self-contradicting legislators is unique for the section in question, all the authors who contribute to the joint research project have one end-goal in common, namely to inform about important perspectives while at the same time opening up for parameters for (more) fruitful, constructive and (if need be) critical debate in the future. With this in mind, four recommendations are presented by the research director for the project. Legally, politically, socially and culturally, conflict-resolution should not translate the relationship between rulers and the ruled into a separation ideology, an instance of controllers versus the controlled. All things being equal, that is the objective limit for a democratic society. (shrink)

We are in a time of rapid change on multiple levels. Change can be seen as positive by one group and negative by another. As a result, different perspectives on any given change can draw completely different conclusions. In these proceedings we want to address different approaches to change from all kinds of perspectives within the realm of citizen science and participatory research. We discuss both active, transformative change, and the observation of change monitored by citizen science in all kinds (...) of disciplines. We highlight the potential of citizen science to be a change maker in research and society, and as a tool to manage the change happening around us. The proceedings "Change - The transformative power of citizen science" showcase a selection of topics that have been presented and discussed at the ECSA/ACSC 2024 double conference in Vienna and highlight the transformative power, citizen science can have. (shrink)

RESUMO Versa o presente artigo sobre a regulação do linchamento no Direito Romano do período antigo, em especial sobre o artigo 9º da Tábua III das Leis das XII Tábuas. A partir de uma metodologia de análise qualitativa, revisão bibliográfica e interpretação textual, os autores objetivam ampliar a visão tradicional sobre o linchamento, compreendendo a institucionalização de sua prática no Direito Romano e sua função no contexto de formação da cultura jurídica do período antigo. A hipótese de trabalho é a (...) de que o artigo 9º da Tábua III das Leis das XII Tábuas apresenta, historicamente, uma forma de punição intermediária entre a linchamento popular extralegal e a pena criminal prevista em lei. Do ponto de vista jurídico-antropológico, a comprovação da hipótese permitiria concluir a ideia de que a pena praticada na antiguidade é uma evolução do controle social informal da violência. Palavras-chave: Linchamento; Direito Romano; XII Tábuas; Pena criminal. ABSTRACT The following paper is about the lynching regulation in Roman law in Ancient Era, especially in what comes about the article 9 of Table Three from Twelve Tables. Making use of a methodology based in qualitative analisys, literature review and interpretation, the auctor aim to expande the traditional view about lynching, understanding the institutionalization of their practice in Roman Law and it’s function in the legal culture in Ancient Era. The working hipothesis is that the article 9 of Table Three of Twelve Tables presents, in a historical context, a intermediate form of punishment between extralegal collective lynching and criminal penalty provided by law. From a legal-anthropological point of view, the proof of the hypothesis would allow us to conclude the idea that the penalty practiced in antiquity is an evolution of informal social control of violence. Keywords: Lynching; Roman Law; Twelve Tables; Criminal Penalty. (shrink)

In arguing against the likelihood of consciousness in non-human animals, Descartes advances a slippery slope argument that if thought were attributed to any one animal, it would have to be attributed to all, which is absurd. This paper examines the foundations of Thomas Willis’ comparative neuroanatomy against the background of Descartes’ slippery slope argument against animal consciousness. Inspired by Gassendi’s ideas about the corporeal soul, Thomas Willis distinguished between neural circuitry responsible for reflex behaviour and that responsible for cognitively or (...) consciously mediated behaviour. This afforded Willis a non-arbitrary basis for distinguishing between animals with thought and consciousness and those without, a methodology which retains currency for neuroscience today. (shrink)

Andre Willis argues that although Hume is generally credited with being a “devastating critic” of religion, it is a mistake to view Hume solely in these terms or to present him as an “atheist.” This not only represents a failure to appreciate Hume’s “middle path” between “militant atheists and evangelical theists”, it denies us an opportunity to “enhance” our understanding and appreciation of the positive, constructive value of religion through a close study of Hume’s views. Willis’s study presents Hume as (...) committed to a “bifurcated approach to religion” that rests on the fundamental distinction between “false religion” and “true religion”. False religion, which includes Christianity, is a... (shrink)

When developing phylogenetic systematics, the entomologist Willi Hennig adopted elements from Nicolai Hartmann’s ontology. In this historical essay I take on the task of documenting this adoption. I argue that in order to build a metaphysical foundation for phylogenetic systematics, Hennig adopted from Hartmann four main metaphysical theses. These are (1) that what is real is what is temporal; (2) that the criterion of individuality is to have duration; (3) that species are supra-individuals; and (4) that there are levels of (...) reality, each of which may be subject to different kinds of law. Reliance on Hartmann’s metaphysics allowed Hennig to ground some of the main theoretical principles of phylogenetic systematics, namely that the biological categories—from the semaphoront to the highest rank—have reality and individuality despite not being universals, and that they form a hierarchy of levels, each of which may require different kinds of explanation. Hartmann’s metaphysics thereby provided a philosophical justification for Hennig’s phylogenetic systematics, both as a theory and as a method of classification. (shrink)

In this article I contrast 17th and 18th explanations of hysteria including those of Sydenham and Willis with those given by Plato and pre-modern medicine. I show that beginning in the second decade of the 17th century the locus of the disorder was transferred to the nervous system and it was no longer connected with the womb as in Hippocrates and Galen; hysteria became identified with hypochondria, and was a disease contracted by men as well as women. I discuss the (...) purely mechanical explanation of hysteria given by Robert Boyle who attributed its cause to corporeal ideas as well as overly sensitive disposition of the nervous system. I relate this the mechanical theory of the nervous system prominent in Descartes' writings on physiology. The paper closes with a discussion of the contrast between early modern explanations of hysteria and the nature of man with those of Freud in the early 20th century. (shrink)

The prescriptive force of methodological rules rests, I argue, on the acceptance of scientific theories; that of the most general methodological rules rests on theories in the philosophy of science, which differ from theories in the several sciences only in generality and abstraction. I illustrate these claims by reference to methodological disputes in social science and among philosophers of science. My conclusions substantiate those of Laudan except that I argue for the existence of transtheoretical goals common to all scientists and (...) concrete enough actually to have bearing on methodology. And I argue that Laudan is committed to such goals himself, willy nilly. (shrink)

In the article titled ‘A new perspective on the race debate’，Robin O. Andreasen argues that contrary to popular scientific belief, human races are biologically real—it is just that we are wrong about them. Andreasen calls her contemporary biological concept of race ‘the cladistic race concept’ (or CRC). Her theory uses theory from cladistics—a systematic school founded by entomologist Willi Hennig in 1950—to define human races genealogically as cladistic subspecies. In this paper I will argue that despite its promise as a (...) biological definition of human races, Andreasen's CRC is unconvincing. In particular, I will show that the central problem of the CRC is its attempt to apply cladistics below the species level. In other words, there is good reason to think that cladistic subspecies are not real, and therefore, they cannot be the target of a realist concept of race. (shrink)

Well prior to the invention of the term ‘biology’ in the early 1800s by Lamarck and Treviranus, and also prior to the appearance of terms such as ‘organism’ under the pen of Leibniz in the early 1700s, the question of ‘Life’, that is, the status of living organisms within the broader physico-mechanical universe, agitated different corners of the European intellectual scene. From modern Epicureanism to medical Newtonianism, from Stahlian animism to the discourse on the ‘animal economy’ in vitalist medicine, models (...) of living being were constructed in opposition to ‘merely anatomical’, structural, mechanical models. It is therefore curious to turn to the ‘passion play’ of the Scientific Revolution – whether in its early, canonical definitions or its more recent, hybridized, reconstructed and expanded versions: from Koyré to Biagioli, from Merton to Shapin – and find there a conspicuous absence of worry over what status to grant living beings in a newly physicalized universe. Neither Harvey, nor Boyle, nor Locke (to name some likely candidates, the latter having studied with Willis and collaborated with Sydenham) ever ask what makes organisms unique, or conversely, what does not. In this paper I seek to establish how ‘Life’ became a source of contention in early modern thought, and how the Scientific Revolution missed the controversy. (shrink)

Perceptual dogmatism holds that if it perceptually seems to S that P, then S thereby has prima facie perceptual justification for P. But suppose Wishful Willy's desire for gold cognitively penetrates his perceptual experience and makes it seem to him that the yellow object is a gold nugget. Intuitively, his desire-penetrated seeming can't provide him with prima facie justification for thinking that the object is gold. If this intuitive response is correct, dogmatists have a problem. But if dogmatists have (...) a problem, you do too (well, most of you anyway). Reliabilists have denounced dogmatism's cognitive penetration problems, but they have problems with cognitive penetration that are even worse. (shrink)

An extensive literature about pictorial representation discusses what is involved when a two-dimensional image represents some specific object or type of object. A smaller literature addresses parallel issues in sculptural representation. But little has been said about the role played by the sculptural material itself in determining the meanings of the sculptural work. Appealing to Nelson Goodman and Catherine Elgin’s discussions of literal and metaphorical exemplification, I argue that the material of which a sculpture is constituted plays key roles in (...) what is represented and how it is represented, in part because we have bodily and emotional responses to the real possibilities the sculptural material creates for us. I discuss examples of contemporary artworks by Melvin Edwards, Kara Walker, Willie Cole, Marc Quinn, Ai Weiwei, Janine Antoni, El Anatsui, Zoe Leonard, and others. (shrink)

The chapter discusses the following quotation from Charles Peirce: "One of these days, perhaps, there will come a writer of opinions less humdrum than those of Dr. (Alfred Russel) Wallace, and less in awe of the learned and official world...who will argue, like a new Bernard Mandeville, that man is but a degenerate monkey, with a paranoic talent for self-satisfaction, no matter what scrapes he may get himself into, calling them 'civilization,' and who, in place of the unerring instincts of (...) other races, has an unhappy faculty for occupying himself with words and abstractions, and for going wrong in a hundred ways before he is driven, willy-nilly, into the right one. Dr. Wallace would condemn such an extravagant paradoxer." Charles Peirce, 1901 -/- . (shrink)

Contributors: -/- John Beatty (British Columbia); Kelly James Clark (Ibn Haldun, Istanbul); Angela Coventry (Portland State); Thomas Holden (UC Santa Barbara); Willem Lemmens (Antwerp); Robin Le Poidevin (Leeds); Jennifer Marusic (Edinburgh); Kevin Meeker (South Alabama); Amyas Merivale (Oxford); Peter Millican (Oxford); Dan O’Brien (Oxford Brookes); Graham Oppy (Monash); Paul Russell (Lund); Andre C. Willis (Brown).

This volume takes cue from the idea that the thought of no philosopher can be understood without considering it as the result of a constant, lively dialogue with other thinkers, both in its internal evolution as well as in its reception, re-use, and assumption as a starting point in addressing past and present philosophical problems. In doing so, it focuses on a feature that is crucially emerging in the historiography of early modern philosophy and science, namely the complexity in the (...) production of knowledge. The book explores the applicability of this approach to a long-considered armchair philosopher, namely René Descartes, who is now more and more understood as a full-blown scientist, networker, and intellectual éminence grise rather than as the mere philosopher of the cogito, as well as the originator of different ‘Cartesianisms’ which encompassed many ideas and approaches for long captured by dichotomic historiographical categories as rationalism and empiricism, or speculative and experimental philosophy. The essays gathered in the volume aim to address the ways in which Descartes’s philosophy evolved and was progressively understood by scientists, philosophers, and intellectuals from different contexts and eras, either by considering direct interlocutors of Descartes such as Isaac Beeckman and Elisabeth of Bohemia, early modern thinkers who developed upon his ideas and on particular topics as Nicolas Malebranche or Thomas Willis, those who adapted his overall methodology in developing new systems of knowledge as Johannes Clauberg and Pierre-Sylvain Régis, and contemporary thinkers from continental and analytic traditions like Emanuele Severino and Peter Strawson. (shrink)

FinTech -- along with the blockchain, other distributed ledger, smart contract, and tokenization usually assumed to accompany it -- could change the way governments procure goods and services. Procurement authorities and procurement law can play a vital role in the development of FinTech. They can help build the FinTech platforms and ecosystems that help them engage in public procurement. They should not try to procure such FinTech outright. At the national level, regulators should not just leave FinTech rulemaking up to (...) financial regulators. Contracting authorities should not just develop or use their own selected FinTech applications willy-nilly. They should contribute to overall changes in procurement law - which extend far beyond simple supervisory or regulatory technologies (RegTech/SupTech). Governments should get serious about the Agreement on Government Procurement and similar treaties - by creating a new authority to help develop the law needed to put FinTech-enabled procurement platforms in place. China’s own world-leading FinTech and cross-border public procurements do not always contribute to a global level playing field. Any FinTech applications facilitating public procurement should thus encourage compliance with the procurement law legal principles the international community has developed over decades. (shrink)

This is a response to a Symposium on Phenomenology and Scripture. In examining a move from phenomenology to scripture, this symposium does not address all possible readers; it addresses a specific readership, for a specific reason, and within the framework of specific assumptions. By way of response, I want first to identify a few features of what I take to be the symposium’s specific address or context. Then, I will comment on what messages I believe the authors have delivered to (...) this context. The symposium specifically addresses those who participate willy nilly in the transcendental project of modern philosophy and of modern northern Europe. In that project, knowing, as noesis, means intentionality: its subject or agent is ultimately reducible to the unity of apperception; and its object— noema—is the object of the ego’s intentional knowing—the thematized object. It appears, furthermore, that the symposium identifies phenomenology not only with the species of Husserlian philosophy, but also with the broader genus of all efforts, from Descartes to Kant to Hegel to Husserl to Heidegger, to identify philosophy with an effort to frame the a priori conditions for, or the possibility of, knowing what we would know: from self to world to being itself—or to God. (shrink)

How does Locke contribute to the development of 18th-century projects for a science of the mind, even though he seems to reject or at least bracket off such an idea himself? Contrary to later understandings of empiricism, Locke goes out of his way to state that his project to investigate and articulate the ‘logic of ideas’ is not a scientific project: “I shall not at present meddle with the Physical consideration of the Mind” (Essay, I.i.2). Locke further specifies that this (...) means his analysis of mental processes will not engage with knowledge of the brain (e.g. in terms of corpuscles and animal spirits), even though he had been the student of Thomas Willis. Now, Kant seemed to make an elementary mistake, given such a clear statement on Locke’s part, when he claimed that Locke’s project was a “physiology of the understanding” (in the Preface to the A edition of the first Critique). One can ask of course what this physiology of the understanding was, and if it existed, in or out of the Lockean intellectual world (as I have sought to investigate in a 2016 paper). This leads me to inquire into the outcome of his empiricism for a scientific treatment of the mind, including in the sense of a ‘naturalization’ of the mind (with implications also for our understanding of empiricism: Anstey’s influential distinction between experimental and speculative philosophy does not seem useful here). Because if Kant made this charge, there were also many 18th-century thinkers who positively treated Locke as their great forerunner in psychology and related fields: Charles Bonnet and Joseph Priestley among them, just as some prominent physicians such as Cabanis claimed to be ‘finishing the job’ that Locke had started in, e.g. their materialist theories of the passions. What one might term ‘the Locke Problem’ here is: how can one reconcile empiricism and claims about cerebral processes, while seeking to remain a Lockean? Differently put, what is the process of naturalization, a naturalization of? (shrink)

Table of Contents Foreword .................................................................................................... ......................................... xiv Preface .................................................................................................... .............................................. xv Acknowledgment .................................................................................................... .......................... xxiii Section 1 On the Cusp: Critical Appraisals of a Growing Dependency on Intelligent Machines Chapter 1 Algorithms versus Hive Minds and the Fate of Democracy ................................................................... 1 Rick Searle, IEET, USA Chapter 2 We Can Make Anything: Should We? .................................................................................................. 15 Chris Bateman, University of Bolton, UK Chapter 3 Grounding Machine Ethics within the Natural System ........................................................................ 30 Jared Gassen, JMG Advising, USA Nak Young Seong, Independent Scholar, South (...) Korea Section 2 From the Outside In: Intelligent Machine Technologies as a Window on Human Morality both as Evolved and as Evident in Internet Discourse, Today Chapter 4 The Emergence of Arti cial Autonomy: A View from the Foothills of a Challenging Climb ............. 51 Fernando da Costa Cardoso, Universidade Nova de Lisboa, Portugal Luís Moniz Pereira, Universidade Nova de Lisboa, Portugal Chapter 5 Semantic Analysis of Bloggers Experiences as a Knowledge Source of Average Human Morality .... 73 Rafal Rzepka, Hokkaido University, Japan Kenji Araki, Hokkaido University, Japan Section 3 From the Inside Out: The Ethics of Human Enhancement from Moral Perception to Competition in the Workplace Chapter 6 Machine Ethics Interfaces: An Ethics of Perception of Nanocognition ............................................... 97 Melanie Swan, Kingston University, UK Chapter 7 Ethical Concerns in Human Enhancement: Advantages in Corporate/Organizational Settings ......... 124 Ben Tran, Alliant International University, USA Section 4 From Far to Near and Near to Far: The Ethics of Distancing Technologies in Education and Warfare Chapter 8 Responsibility and War Machines: Toward a Forward-Looking and Functional Account ................. 152 Jai Galliott, Macquarie University, Australia Chapter 9 Ethical Responsibilities of Preserving Academicians in an Age of Mechanized Learning: Balancing the Demands of Educating at Capacity and Preserving Human Interactivity ................... 166 James E. Willis III, Indiana University, USA Viktoria Alane Strunk, Independent Scholar, USA Section 5 Wrapping Things Up, then Unwrapping Them Again: Integral Visions of Morality in a Technological World, Over Evolutionary Time, with Revolutionary Means, and with Open Questions about the Final Purpose of It All Chapter 10 Bridging Two Realms of Machine Ethics ........................................................................................... 197 Luís Moniz Pereira, Universidade Nova de Lisboa, Portugal Ari Saptawijaya, Universidade Nova de Lisboa, Portugal & Universitas Indonesia, Indonesia Chapter 11 Robots in Warfare and the Occultation of the Existential Nature of Violence ................................... 225 Rick Searle, IEET, USA Chapter 12 Self-Referential Complex Systems and Aristotle’s Four Causes ........................................................ 239 Aleksandar Malecic, University of Nis, Serbia Related References .................................................................................................... ........................ 261 Compilation of References .................................................................................................... ........... 292 About the Contributors .................................................................................................... ................ 325 Index .................................................................................................... ............................................... 329 . (shrink)

NUTRIÇÃO SOBRE AS FALHAS REPRODUTIVAS DOS BOVINOS -/- E. I. C. da Silva Departamento de Agropecuária – IFPE Campus Belo Jardim Departamento de Zootecnia – UFRPE sede -/- -/- FALHAS REPRODUTIVAS DE BOVINOS -/- INTRODUÇÃO -/- Os bovinos, assim como tantos outros mamíferos e demais espécies, podem sofrer distúrbios durante o ciclo reprodutivo. Transtornos, alterações ou patogenias afetam diretamente a saúde do sistema reprodutor desses animais. As causas podem ser individuais ou multifatoriais, de caráter parasitário, patogênico, climático, nutricional etc. As (...) causas de caráter parasitário podem ser controladas mediante a assepsia e profilaxia para a eliminação dos parasitas como carrapatos que vivem no mesmo habitat que o animal. As de caráter patogênico, como estão relacionadas à doenças, necessitam de especialistas na área, como o médico-veterinário para a avaliação, diagnóstico e tratamento por meio de práticas cirúrgicas ou na administração de fármacos. O fator clima pode ser controlado mediante o investimento em tecnologia e aquisição de equipamentos que possam manter a integridade e o bem-estar do animal, seja por ventiladores, exaustores, nebulizadores, aspersores, etc. Por fim, as de caráter nutricional podem ser prevenidas mediante a boa administração energética, proteica e mineral, além de uma boa qualidade de alimento volumoso ou concentrado que atenda e supra os requerimentos exigidos por cada categoria animal. Sendo assim, pode-se dividir as falhas reprodutivas dos machos bovinos relacionados à nutrição em energia, proteína, minerais e vitaminas. Antes disso, essas falhas estão relacionadas aos fatores de degeneração testicular e casos de hipospermia. -/- 17.1 Degeneração testicular e Hipospermia -/- Degeneração testicular é uma importante causa de infertilidade em machos de todas as espécies. Entre as causas, podem ser consideradas a elevação da temperatura testicular (por isso torna-se importante que a bolsa escrotal tenha um certo tamanho que permita aos testículos ficarem longe do corpo, uma vez que a temperatura corporal mataria os espermatozoides, sendo essencial os testículos ficarem “caídos” para que possam ter no mínimo 2-3 °C à mesmos do que a temperatura corporal), infecções, fatores nutricionais, lesões vasculares, lesões obstrutivas etc. O testículo com degeneração mostra diminuição de tamanho, fibrose, alterações na espermatogênese, aumento de esperma imaturo ou anormal e azoospermia em casos severos. -/- Em casos de lesão testicular com dano parcial sobre o epitélio germinal, apresenta-se uma menor taxa de formação e maturação das células espermáticas. O macho pode ser fértil, mas a condição de hipospermia levará à que, sob condições de estresse ou alta carga de fêmeas a cobrir, se apresentem falhas na fertilização. Ejaculados com características de hipospermia não podem ser congelados, logo não servem para a indústria do sêmen. -/- -/- Deficiências nutricionais retardam o início da puberdade e deprimem a produção e as características do sêmen. Os efeitos da má nutrição podem ser corrigidos em animais maduros, enquanto que é menos bem sucedido em animais jovens devido aos danos permanentes causados no epitélio germinal do testículo. (FRAZER, 2005; GORDON, 1996). Entre as principais limitantes de origem nutricional temos: -/- 17.2 Vitaminas -/- 17.2.1 Vitamina A -/- A deficiência de vitamina A e provitamina A (já que é essencial direta ou indiretamente para a função de todos os órgãos e particularmente para o crescimento e desenvolvimento dos epitélios) é necessária para a diferenciação celular, processo no qual se modificam as células não especializadas de modo que possam realizar funções específicas. Os órgãos reprodutores exigem retinol para que possam realizar o processo de espermatogênese normal nos machos e para prevenir a necrose placentária e a mortalidade fetal na fêmea. Carências de Vitamina A produzem: degeneração do epitélio germinal, baixa espermiogênese parcial ou total, cornificação do epitélio vaginal, irregularidades do estro, atrasos na concepção, abortos, crias fracas e/ou deficientes visuais (cegas) e uma degeneração da placenta e a retenção da mesma. A deficiência da vitamina A pode conduzir a uma degeneração dos tubos seminíferos nos bovinos jovens e deve-se ao fato da supressão da liberação de gonadotropinas hipofisárias e noutros casos, a espermatogênese é impedida e as funções das células de Sertoli e de Leydig são alteradas. A vitamina A não é sintetizada no organismo, o que leva a uma dependência direta do fornecimento dessa vitamina através dos alimentos que o criador têm na propriedade, seja forragens ou concentrados de ótima qualidade. -/- Essa vitamina é essencial para os animais e humanos, visto que participa de inúmeras funções metabólicas no corpo dos mesmos. Sendo assim, o criador deve saber das exigências vitamínicas do seu rebanho. Em bovinos de corte a exigência e a recomendação de fornecimento dessa vitamina está entre 2200 UI/kg de MS para animais em crescimento e engorda e para reprodutores recomenda-se níveis de 3900 UI/kg de MS. Já para bovinos leiteiros esses números são diferentes, de acordo com livros de nutrição de ruminantes, animais em crescimento e engorda devem consumir matéria seca com teores de 80 UI/kg de MS, já para reprodutores e animais adultos a quantidade recomendada e exigida é de 110 UI/kg de MS, isso diariamente. As forragens suprem bem a exigência de vitamina A dos animais, em especial o capim tifton e o tanzânia são os mais recomendados uma vez que possuem altos teores vitamínicos e minerais. As vias de suplementação dessa vitamina é através das forragens (mais acessível e barato), através da ração concentrada ou pela água e suplementação injetável. -/- 17.2.2 Vitamina E -/- A vitamina E é uma substância também conhecida como tocoferol, sendo sua forma mais ativa o alfa tocoferol. A vitamina E pertence ao grupo de vitaminas lipossolúveis amplamente distribuídas nos alimentos. -/- A sua principal função é descrita como um antioxidante natural, agindo como tal, a vitamina E evita a oxidação de constituintes celulares essenciais e/ou evita a formação de produtos tóxicos de oxidação, como os produtos de peroxidação formados a partir de ácidos graxos insaturados que foram detectados através de sua ausência. Essa vitamina é essencial para a reprodução normal em várias espécies de mamíferos. Ela ainda têm sido usada em clínicas reprodutivas de todo o mundo para o tratamento de abortos recorrentes e da infertilidade em ambos os sexos (CHAN, 2003). -/- -/- A deficiência da vitamina E influencia a maturação espermática e a degeneração do epitélio germinal dos túbulos seminíferos, já que ela os protege da oxidação evitando a deterioração da peroxidase sobre os fosfolipídios poli-insaturados da membrana espermática (PITA RODRÍGUEZ, 1997). A deficiência dessa também evita o crescimento anormal. Na ausência de vitamina E, a quantidade de gorduras insaturadas dentro das células diminuem, causando anomalias estruturais e funcionais das organelas mitocondriais, lisossomos e até mesmo na membrana celular, se essa falta de vitamina E no adulto tornar-se acentuada ocorrerá a degeneração precoce do epitélio germinal, o que afeta, em primeiro lugar, as células mais evoluídas: os espermatozoides, cuja mobilidade se perde e sua formação torne-se cada vez mais rara, até chegar ao nível de esterilidade completa. -/- As exigências dos bovinos de corte quanto a vitamina em questão é de 15 – 60 UI/kg de MS diárias para animais em crescimento e engorda. Já para bovinos leiteiros, essa exigência é muito menor chegando a 0,8 UI/kg de peso vivo (PV) para animais em crescimento e engorda e para animais adultos e reprodutores cerca de 1,6 UI/kg de PV diários. Os alimentos, assim como as vias de suplementação ideais, são os mesmos mencionados no tópico acerca da vitamina A. -/- 17.3 Proteínas -/- O efeito do excesso de proteína da dieta na reprodução é complexo. Os excessos de proteína podem também ter um efeito negativo na reprodução. Alguns efeitos foram demonstrados para explicar o pobre desempenho reprodutivo que algumas vezes é observado em dietas com excessivos níveis de proteína: Podem apresentar-se altos níveis de ureia no sangue, o que possui efeito tóxico sobre os espermatozoides, óvulos, e o embrião em desenvolvimento (WATTIAUX, 1990), igualmente, apresenta-se um desequilíbrio energético que em casos severos bloqueia a liberação de LH produzindo alteração na maturação espermática nas células de Leyding. -/- As proteínas são importantes para todo o funcionamento normal e funções fisiológicas e metabólicas dos animais e do homem. Logo, a tabela 1 traz os níveis recomendados e exigências de bovinos de corte de diferentes categorias para que se possa prevenir e/ou combater as possíveis degenerações testiculares bem como a hipospermia, trazendo os requerimentos de bovinos leiteiros jovens o que é mais ideal para combater previamente esses distúrbios que afetam diretamente a função reprodutiva e o desemprenho dos animais. -/- Tabela 1: Exigências de proteína metabolizável (PM) e proteína bruta (PB), para diferentes categorias de bovinos de corte -/- BAIXE O PDF E VISUALIZE A TABELA -/- Para os bovinos leiteiros jovens, os níveis de PB presente na dieta dos animais entre 150 e 400 kg de PV podem ser entre 12 e 22%, o que é ideal para a prevenção de degenerações, atraso à puberdade ou qualquer anormalidade que afete o desempenho dos animais. -/- Os alimentos mais proteicos são os de origem animal, porém não se pode ofertá-los completamente e diretamente aos animais, isto é, deve-se misturá-los a outros ingredientes; logo, o tipo e a quantidade de proteína depende dos ingredientes, do método de alimentação e do potencial produtivo e genético dos animais. -/- 17.4 Minerais -/- 17.4.1 Manganês (Mn) -/- O manganês é um componente de várias enzimas e essencial para a estrutura óssea normal. Quando a alimentação é deficiente em Mn por algumas semanas, o corpo parece conservar este mineral de forma eficaz. -/- Numa dieta média, cerca de 45% do mineral ingerido é absorvido. A absorção pode ser diminuída com o consumo de quantidades excessivas de Ca, P ou Fe. Após a absorção, o Mn liga-se à sua proteína transportadora e é conhecido como transmanganina. Os ossos, e em menor quantidade o fígado, músculos, e pele servem como locais de armazenamento desse mineral. -/- O Mn está envolvido na função pancreática e na utilização correta da glicose, sendo também um interveniente ativo na produção de tiroxina e de hormonas sexuais. Tem importância na produção do colesterol e no metabolismo de gorduras. -/- O Mn é um mineral de grande afinidade com o aparelho reprodutor. A deficiência desse elemento produz uma diminuição da fertilidade, atraso no desenvolvimento testicular e diminuição da espermatogênese. Se houver atrofia dos testículos, a produção de espermatozoides será reduzida e, portanto, a fertilidade será afetada. -/- A quantidade de 13 mg de Mn por kg de MS é suficiente para a obtenção de um crescimento adequado, mas para um crescimento testicular ideal e constante é necessário um mínimo de 16 mg de Mn por kg de MS. -/- Para uma boa suplementação que atenda às necessidades do gado de corte e leite, o nível ideal de Mn presente na MS em mg/kg deve estar entre 12 – 18 para os bovinos leiteiros e entre 20 – 50 para o gado de corte, tendo como recomendação ideal cerca de 40 mg/kg de MS diários para ambos. Esse mineral pode estar presente tanto na água quanto nas plantas presentes no pasto, portanto a suplementação natural é a melhor escolha, caso necessário a suplementação artificial através da ração no cocho ou do sistema SMI é recomendada. -/- 17.4.2 Iodo (I) -/- A deficiência de I também ocasionar dificuldades reprodutivas e hipospermia. Só a captação da tiroide responde à TSH, e somente a glândula endócrina tiroide incorpora esse elemento nos hormônios que são por ela elaborados. Assim, mais de 90% do iodo do organismo é encontrado nas glândulas tireóideas, principalmente como iodo orgânico. Este grande acúmulo de I na glândula é trocado muito lentamente, cerca de 1% por dia. -/- O I entra no organismo via oral e sob a forma de íon iodeto, absorvendo-se muito facilmente desde o aparelho digestivo e passando rapidamente à corrente circulatória e, posteriormente à glândula tiroide (ALBARRACÍN, 2005) onde tem que vencer um gradiente de concentração de 1 a 20; todavia, dada a afinidade entre essa glândula e o iodo, não existe nenhum problema na organização. Na célula folicular, através da ação da peroxidase, converte-se em I molecular que passa para o coloide para se ligar à tiroglobulina e formar as hormonas tireóideas. -/- O I pode atuar sobre o aparelho genital diretamente ou através da hipófise. A tiroidectomia reduz a produção espermática, por sua vez a tiroxina exótica pode restaurá-la. Essa última, administrada dentro de seus limites fisiológicos, aumenta a produção espermática ao incrementar o metabolismo geral. Talvez, o mecanismo mais aceito para atingir esta função fisiológica seja a regulação do consumo de oxigênio pelas células espermáticas. -/- O I pode ser fornecido em quantidades entre 0,2 e 1,0 mg/kg de MS para todas as categorias animais e sem que o produtor possa se preocupar. O I, que é de suma importância, encontra-se na água e nos vegetais, porém pode ser incrementado via alimentação concentrada ou através da injeção mineral direta no animal. -/- 17.5 Energia -/- A disponibilidade de energia está diretamente relacionada com o padrão normal de pulsatilidade do LH. No caso do balanço energético negativo (BEN), verifica-se um rápido aumento da utilização de glicose, resultando em hipoglicemia e, por conseguinte, hipoinsulinemia que, como se sabe, conduz rapidamente a uma lipólise com maior disponibilidade de ácidos para oxidação. Por sua vez, a síntese de colesterol precursor de esteroides sexuais é diminuída. A alteração da relação estrogênios- androgênios no macho causa uma expressão pobre da libido ou desejo sexual. -/- No touro a subnutrição afeta intensamente a função secretora das glândulas acessórias, provocando uma diminuição de 30 a 60% nas concentrações de frutose e ácido láctico do esperma. A subnutrição afeta, sobretudo, a atividade androgênica e a espermatogênese. -/- REFERÊNCIAS BIBLIOGRÁFICAS -/- BARRENHO, Gonçalo José Pinheiro. Nutrição e fertilidade em bovinos de leite. 2016. Dissertação de Mestrado. Universidade de Évora. -/- BERCHIELLI, Telma Teresinha; PIRES, Alexandre Vaz; OLIVEIRA, SG de. Nutrição de ruminantes. Jaboticabal: funep, 2006. -/- BICUDO, S. D.; SIQUEIRA, J. B.; MEIRA, C. Patologias do sistema reprodutor de touros. Biológico, São Paulo, v. 69, n. 2, p. 43-48, 2007. -/- BINDARI, Yugal Raj et al. Effects of nutrition on reproduction-A review. Adv. Appl. Sci. Res, v. 4, n. 1, p. 421-429, 2013. -/- BOLAND, M. P. Efectos nutricionales en la reproducción del ganado. XXXI Jornadas Uruguayas de Buiatría, 2003. -/- CHAN, Willie Hing Chang. Uso de Tamoxifeno y Vitamina E en Pacientes con Varicocele. 2003. Tese de Doutorado em Urologia. Universidad de Granada, España. -/- DEHNING, R. Interrelaciones entre nutrición y fertilidad. In: Curso Manejo de la Fertilidad Bovina18-23 May 1987Medellín (Colombia). CICADEP, Bogotá (Colombia) Universidad de La Salle, Medellín (Colombia) Instituto Colombiano Agropecurio, Bogotá (Colombia) Sociedad Alemana de Cooperación Técnica-GTZ (Alemania), 1987. -/- DE LUCA, Leonardo J. Nutrición y fertilidad en el ganado lechero. XXXVI Jornadas Uruguayas de Buiatría, 2008. -/- DIAS, Juliano Cesar et al. Alguns aspectos da interação nutrição-reprodução em bovinos: energia, proteína, minerais e vitaminas. PUBVET, v. 4, p. Art. 738-743, 2010. -/- FRAZER, Grant S. Bovine theriogenology. Veterinary Clinics: Food Animal Practice, v. 21, n. 2, p. xiii-xiv, 2005. -/- GORDON, Ian. Controlled reproduction in farm animals series. Nova Iorque: CAB International, 1996. -/- MAAS, John. Relationship between nutrition and reproduction in beef cattle. The Veterinary Clinics of North America. Food Animal Practice, v. 3, n. 3, p. 633-646, 1987. -/- MAGGIONI, Daniele et al. Efeito da nutrição sobre a reprodução de ruminantes: uma revisão. PUBVET, v. 2, n. 11, 2008. -/- NATIONAL RESEARCH COUNCIL et al. NRC. Nutrient requirements of domestic animals. Nutrient requirements of beef cattle. Washington, DC: National Academy Science, 1996. -/- NICODEMO, M. L. F.; SERENO, J. R. B.; AMARAL, T. B. Minerais na eficiência reprodutiva de bovinos. Embrapa Pecuária Sudeste-Documentos (INFOTECA-E), 2008. -/- PASA, Camila. Relação reprodução animal e os minerais. Biodiversidade, v. 9, n. 1, 2011. -/- PITA RODRÍGUEZ, Gisela. Funciones de la vitamina E en la nutrición humana. Rev. cuba. aliment. nutr, v. 11, n. 1, p. 46-57, 1997. -/- RADOSTITS, Otto M. et al. (Ed.). Veterinary Medicine E-Book: A textbook of the diseases of cattle, horses, sheep, pigs and goats. Elsevier Health Sciences, 2006. -/- SANTOS, José Eduardo Portela. Efeitos da nutrição na reprodução bovina. In: Congresso Brasileiro de Raças Zebuínas. 1998. p. 24-75. -/- SARTORI, Roberto; GUARDIEIRO, Monique Mendes. Fatores nutricionais associados à reprodução da fêmea bovina. Revista Brasileira de Zootecnia, v. 39, p. 422-432, 2010. -/- SHORT, Robert E.; ADAMS, D. C. Nutritional and hormonal interrelationships in beef cattle reproduction. Canadian Journal of Animal Science, v. 68, n. 1, p. 29-39, 1988. -/- TEIXEIRA, J. C.; TEIXEIRA, LFAC. Alimentação de bovinos leiteiros. FAEPE, Lavras, 1997. -/- WATTIAUX, Michel Andre. Reproduction and nutrition. Babcock Institute for International Dairy Research and Development, Madison: University of Wisconsin, 1995. (shrink)

In telling the story of Thomas Willis and the collective investigations of body and brain in 17th-century England with tremendous energy and enthusiasm, journalist Carl Zimmer has written one of the best recent books of popular history of science. The full range of readers will be rewarded by Zimmer’s synthetic scholarship and his evident pleasure in the language of the primary texts. While he owes much to the work of Robert Frank and Robert Martensen in particular, Zimmer has negotiated a (...) vast secondary literature on the major figures of early modern natural philosophy. His decision not to discuss scholarly controversy directly, but rather ‘to give accounts of these people that were consistent with the current consensus’ (p.304) is understandable given the mass market at which he has successfully aimed: yet such a voice would bring a welcome freshness to specialists’ debates. (shrink)