A Hebrew translation of William James's essay "Reflex Action and Theism", The Will to Believe and other essays in Popular Philosophy (1897): 111-144.

This review essay (in Hebrew) considers the volume Judaism, Race, and Ethics, edited by Jonathan K. Crane (Penn, 2020), and briefly presents the content of the articles included in this important volume. The review then raises several substantial axiological and linguistic questions considering the term "race", and suggests some moral insights from Jewish tradition regarding the idea of the oneness of humanity and of all human creatures, as a basis for opposing racism.

Over recent decades, several global tech giants have gained enormous power while at the same time generating various disputes with their end-users, local governments, and regulators. We propose that the Jewish concept of covenant can help the above parties, legal scholars, and wider society, in addressing this complex legal reality. We present the challenge of disequilibrium between the above four parties against the main points of conflict: the requirement of customer consent; clear contractual provisions upon entry; options for reasonable customer (...) exit; limitations on the platform’s ability to exercise unilateral termination; profile-based discrimination; and liability for mere intermediation. We introduce the biblical concept of covenant, and we review its unfolding in Jewish tradition. Further, we conceptualize three main covenantal principles: (1) responsibility—God and humans are both conceived as moral agents; (2) reciprocity—God as a caring law giver, open to human appeals; and (3) reasonability—divine instruction as initially intelligible. We demonstrate how the latter principle of explainability is exercised in the biblical law narratives and how the story of Balaam stresses the significance of moral agency that cannot hide behind “mere intermediary” claims. In light of this analysis, we revisit the relationship between tech giants and tech users to demonstrate how covenantality offers novel ways to conceptualize the noted conflicts between the parties. (shrink)

Chosenness, Agapism, and the Search for Moderation between Nationhood and Universalism -/- Abstract The idea of collective Chosenness (nivḥarut) was interpreted by Jewish thinkers in two initial ways: Chosenness as a divine gift which is somehow encrypted in the body of each Jewish individual, and Chosenness as a normatively acquired (rather than inherited) property. Numerous attempts were made to defend these approaches, and to mediate between them. This paper examine the idea of Chosenness from a novel perspective, by interrogating it (...) with its mirror concept, namely the Christian Agape which mandates the love of and the care for every human being, regardless of their nationality, merit, ethnicity, or ‘race’. The agapic stance has its origin in the Hebrew Bible, and was robustly developed in the Christian tradition with its distinctive universal trajectory. The significance of Agape - which is almost absent from the research on Jewish Thought vis-à-vis Christianity - to the issue of national election, is the agapic emphasis on the election of humanity as a whole. Juxtaposing chosenness with agapism sheds new light on the old issue of chosenness, in several ways: First, by demonstrating that not only narrow chosenness has its moral pitfalls; radical forms of Agape too have their moral prices. Secondly, the contextualization of chosenness vis-a-vis Agape invites a search for middle ways that balance between the two polarities. Thirdly, given that there are moderations between chosenness and Agape in both Judaism and Christianity, establishing the conceptual axis ‘Chosenness-Agapism’ may enrich Jewish-Christian interfaith discourse, thus contributing to the ability of Jewish and Christian interlocutors to better understand how their Abrahamic fellow challenges their tradition in a way which is vital to the pursuit of their own tradition’s equilibrium. (shrink)

This book-chapter investigates the pragmatist Zionist thought of Mordecai M. Kaplan, and considers its pluralistic and holistic traits, vis-a-vis monist and fundamentalist approaches to Zionism.

This chapter does not presume to outline a new economic theory, nor a novel perspective on Jewish approaches to economy. Rather, it suggests the concept of pragmatic interestedness (PI) as means for thinking on the search for conscious or moral forms of capitalism. In short, pragmatic interestedness means that having interests is basic to human nature, and that interestedness is or can be non-egoistic and pro-social. This chapter proposes that PI, which has a significant role in normative Jewish tradition, can (...) contribute to the articulation of conscious capitalism. The chapter first defines what pragmatic interestedness is, and its opposite, namely disinterestedness (DI), which demands total impartiality. The second section considers the influential Christian concept of Agape or universal and egalitarian love, which is arguably at tension with eros and particular commitments (and with PI in this regard). It is argued that prominent modern philosophies secularize the Agape, especially Karl Marx’s Communism and Peter Singer’s Sentientism, in a way that marginalizes PI. The third section explores the appearance of pragmatic interestedness within rabbinic Jewish tradition, by (i) presenting the complicated duality of the concept of interest, (ii) emphasizing the recognition of human needs and interests in Judaism and (iii) highlighting Jewish sensitivity to the differences between various spheres of human commitment, and (iv) the role of market and economic considerations in Jewish tradition. The fourth section reflects more broadly on how PI may contribute to the conception of conscious or humane capitalism. (shrink)

This article argues that certain interpretive trajectories within Jewish tradition – both halakhic (nomos) and aggadic (narrative) – can be illuminated vis-a-vis classical American pragmatism (CAP). Contrary to a prevalent belief, Peirce, James, and Dewey were neither anti-metaphysical nor anti-traditional. They contended, in different ways, that the ‘pragmatic maxim’ (PM) – “truth is what works” in James’s phrasing – is not a narrowly instrumentalist truth test. The PM rather implies that ideas and beliefs (philosophical and religious alike) should be examined (...) against their worldly consequences. After a clarification of this relational idea in its pragmatist philosophical context, and an introductory sketch of the appearances of the PM in Jewish tradition, the article examines the PM within the thought of Rabbi Ḥayyim Hirschensohn (RḤH; 1857-1935). The article runs as follows: Section 1 presents CAP and clarifies what the PM is. Section 2 offers a bird’s eye mapping of the application of the PM within Jewish tradition. Section 3 briefs RḤH’s intellectual biography and elaborates on his pragmatist premises and his application of the PM. Rather than conceiving divine commandments as an arbitrary dictate, RḤH viewed them as purposive, relational, and as constituted and reaffirmed by individual and collective human agreements. Finally, the article reflects on the theological-intellectual prerequisites for the application of the PM. (shrink)

This book-chapter briefs Eliezer Schweid's thought, and demonstrates the role of some core-concepts of classical American pragmatism within it.

In classical American pragmatism, fallibilism refers to the conception of truth as an ongoing process of improving human knowledge that is nevertheless susceptible to error. This paper traces appearances of fallibilism in Jewish thought in general, and particularly in the halakhic thought of Eliezer Berkovits. Berkovits recognizes the human condition’s persistent mutability, which he sees as characterizing the ongoing effort to interpret and apply halakhah in shifting historical and social contexts as Torat Ḥayyim. In the conclusion of the article, broader (...) questions and observations are raised regarding Jewish tradition, fallibility, and modernity, and the interaction between Judaism and pragmatism in the history of ideas. (shrink)

This paper traces two contradicting beliefs about death and immortality in the writings of Rabbi Hayyim Hirschensohn, and examines these opposing beliefs in his Halakhic ruling, in the case of Autopsies. The paper opens by conceptualizing two possible attitudes regarding the relation between this-world and the ʽother-world’, and by analyzing two main beliefs regarding death and immortality in their relation to the body-spirit distinction (the naturalistic and the spiritualistic approach). It demonstrates how Hirschensohn was holding these two different views. The (...) paper then moves to examine whether his halakhic ruling may help us in understanding which approach was Hirschensohn’s favorable belief, by investigating his halakhic ruling regarding autopsies. Hirschensohn permits to perform such surgeries, however subject to some halakhic limitations. The paper concludes that the naturalistic belief regarding death appears to be the more dominant one in his thought. Finally, I point out a few consequences of this paper, for addressing some contemporary ethical dilemmas regarding human corpses. (shrink)

The urgent call by UNESCO to scale up interventions for the achievement of sustainable development goals motivated this study to assess the level and association of teachers' (n =107) and students' (n = 342) knowledge, attitudes, and behaviors (KAB) regarding education for sustainable development, focusing on Pili (Canarium ovatum). This is a subset of a larger project that involves Pili to contextualize learning and instructional materials. The researchers used a descriptive cross-sectional survey approach and distributed a questionnaire through Google Forms. (...) KAB levels were categorized into poor, moderate, and high using descriptive data analysis, and their association with one another was determined by using Pearson's Chi- square. The findings indicated that, although the associations among the KAB of teachers were distinct from those of the students, they both perceived that possessing favorable knowledge and attitudes was insufficient to generate positive behaviors. Thus, the efforts to increase teachers' and students' motivation and involvement and to help them carry out favorable behaviors toward sustainable development were imperative. Given this, identifying the barriers to converting knowledge and attitudes into behaviors and considering the factors that involved the association of KAB in promoting sustainable development, particularly in education, were recommended. (shrink)

Teachers are the frontline workers in sustaining quality education; hence, assessing their knowledge, attitudes, and behaviors (KAB) allows them and the administrators to create better training, programs, and instructional materials. The objective is to develop and validate a quick and accessible online instrument to assess the teachers’ KAB towards sustainable development in the Philippine context, as part of a bigger project to integrate Pili (Canarium ovatum) into education. The researchers administered the instrument using a cross-sectional survey method through Google Forms (...) in which respondents (n = 206) had voluntarily answered. The 24-item tool, anchored on the 2030 sustainable development goals and their complex systems, is reliable and valid based on the confirmatory factor analysis, and Cronbach’s alpha and Fleiss’s kappa estimates. The results showed that having favorable knowledge and attitudes toward sustainable development is inadequate to create positive behaviors. The adaptation of the developed instrument, the use of findings for intercultural and cross-cultural studies, and further investigations are recommended. (shrink)

This article presents Franz Rosenzweig’s concept of redemption as a vehicle for raising some important questions for confronting the contemporary movement of Transhumanism. The upshot of our discussion is located in the existential questions asked, following a philosophical comparison of Rosenzweig’s religious and philosophical commitment to human life in its most robust form, with Transhumanism’s scientistic vision. To do so, the article first discusses some techno-scientistic assumptions of Transhumanism, showing that it presumes what was once a core principle of German (...) Idealism, the identity of reason and being, against which Rosenzweig rebelled. Then, the article turns to examine Rosenzweig’s humanistic redemptive vision and its emphasis on the corporeal, the temporal, and the worldly. The conclusion makes explicit the ways in which Rosenzweig’s redemptive vision provides a contrasting model to the one set forth by Transhumanism. (shrink)

Gamification in education offers an innovative way of learning. However, some studies claim that, while it helps raise students’ motivation, the kind of motivation is extrinsic and, so, intrinsic motivation declines with time. The researchers used the descriptive research design to describe the STEM students’ intrinsic motivation along with the utilization of game elements in teaching genetics through a learning management system. The researchers collected quantitative data using the Intrinsic Motivation Inventory, which were analyzed through descriptive statistics and complemented with (...) qualitative data from the students’ journals and interviews. Overall, the students agreed (M = 5.38, SD = 1.20) that gamification, despite being characterized as extrinsically motivating, had intrinsically motivated them. Its proper implementation helps students adapt to and overcome unfavorable behaviors towards competitiveness and emphasizes the role of teachers in facilitating learning. Time constraints, peer pressure, and distractions were noted; hence, more research is needed to address these challenges and determine the long-term effects of gamification. (shrink)

Faith has many aspects. One of them is whether absolute logical proof for God’s existence is a prerequisite for the proper establishment and individual acceptance of a religious system. The treatment of this question, examined here in the Jewish context of Rabbi Prof. Eliezer Berkovits, has been strongly influenced in the modern era by the radical foundationalism and radical skepticism of Descartes, who rooted in the Western mind the notion that religion and religious issues are “all or nothing” questions. Cartesianism, (...) which surprisingly became the basis of modern secularism, was criticized by the classical American pragmatists. Peirce, James and Dewey all rejected the attempt to achieve infallible absolute knowledge, as well as the presumptuousness of establishing such a knowledge by means of casting Cartesian hyperbolic doubt. They advocated an alternative approach which was more holistic and humane. This paper lays out Descartes’s approach and the pragmatists’ critique. Despite the place that pragmatic considerations hold in Jewish tradition, some thinkers reject the relevance of these ideas. Yet Berkovits’s thought suggest a different path. He rejected Descartes’ radical skepticism and his radical foundationalism, in favor of a moderate foundationalism, which allows for a belief in God alongside constructive doubts. Similar to Peirce’s conception of the fixation of belief, Berkovits views local doubts (distinct from the hyperbolic doubt) as necessary for thought. Berkovits’s understanding of the biblical human-divine encounter, following Rosenzweig, Buber, and Heschel, is conceptualized here as “encounter theology”. Berkovits criticizes the propositionalist attempts to prove God’s existence logically, as well as the presumptuousness of basing religious belief on the teleological world-order. However, Berkovits’s conception of the ‘caring God’ is not provable, and thus defined as a pragmatic ‘postulate’. The article concludes by considering Berkovits’s “encounter theology”. In contrast to the approach described by Haym Soloveitchik, of halakhic stringency and lack of subjective experience of God’s face, Berkovits’s approach is dialogic through and through. (shrink)

This article examines A.J. Heschel’s “Theology of pathos” in light of the critique Eliezer Berkovits raised against it. Heschel’s theology of pathos is the notion of God as the “most moved mover”, who cares deeply for humans, and thus highly influencing their prophetic motivation for human-social improvement. Berkovits, expressing the negative-transcendent theology of Maimonides, assessed that Heschel’s theology of pathos is not systematic, is anthropomorphic, and reflects a foreign Christian influence. However, when checking Berkovits’s own views as a thinker, it (...) turns out that he formulated some immanent theological notions that were overlapping those of Heschel, for example in attributing God the personal trait of caring. Surprisingly, most Heschel’s scholars did not consider this point. This riddle addressed here in two ways: (1) Psychological and Social, on which I understand Berkovits’s critique as a way of coping with his own religious perplexities, and in a wider sense, it is asserted that trans-denominational critique may be a discursive opportunity for mutual corrigibility. (2) Theological, since Heschel and Berkovits indeed faced a similar theological challenge, of rejecting any description of God as anthropomorphism. I thus offer a constructive theological argument for providing a justification to the immanent theologies of both Heschel and Berkovits. (shrink)

Techno-ethics is the area in the philosophy of technology which deals with emerging robotic and digital AI technologies. In the last decade, a new techno-ethical challenge has emerged: Autonomous Weapon Systems (AWS), defensive and offensive (the article deals only with the latter). Such AI-operated lethal machines of various forms (aerial, marine, continental) raise substantial ethical concerns. Interestingly, the topic of AWS was almost not treated in Jewish law and its research. This article thus proposes an introductory ethical-halakhic perspective on AWS, (...) in the Israeli context. The article has seven sections. Section 1 defines AWS and the main ethical concerns it evokes, while providing elementary definitions and distinctions. §2 locates AWS within the realm of Jewish laws of war (hilkhot-ẓava), which recognize the right for self-defense, as well as the status of universally accepted moral norms. §3 unfolds pragmatic ethical premises of a humane techno-ethics, which are required for the identifying AWS as a moral question: I. Relationality; II. Technology is not (completely) neutral; III. The fallaciousness of transhumanism. It is argued that these premises are compatible with halakhic tradition. §4 investigates the question of the morality of AWS, within the field of military AI ethics. It is clarified why the standard categories of war-ethics (ad bello, in bellum) do not capture the singular ethical problem of AWS, which pertains to the operation of military means, rather than their human targets. It is argued that reductive perception of the human mind is misleading about the feasibility of ‘ethical robots’, capable of independent moral discretion. To provide a thick examination of human agency from the perspective of Jewish tradition, §5 explores two stories from the biblical book of Samuel (the murder of Nob’s priests and of Uriah). The lessons about the significance of moral agency within the pubic-political military sphere are made explicit, as well as the possible costs resulting from the loss of human agency in the case of AWS. Given that realpolitik considerations are basic in halakhah, §6 considers some possible contemporary socio-political implications of the AWS, that may risk the sustainability of the democratic project. §7 concludes by pointing out humane contributions of Jewish law to contemporary techno-ethics. (shrink)

Please see the extended abstract in the attached file.

This review-essay considers the book by Moshe Halbertal, The Birth of Doubt: Confronting Uncertainty in Early Rabbinic Literature (Brown, 2020), and highlights certain pragmatist trajectories in the book and in its scholarly object - early rabbinic law. Inter alia, the middle rabbinic path between realism and nominalism is discussed.

This review-essay considers two books by David Brezis and Hannah E. Hashkes, and discusses their significance for exploring the philosophical links between Jewish thought and classical American pragmatism.

Ayalon Eidelstein’s Openness and Faith focuses on the centrality of the idea of openness, or open-mindedness, to the educational sphere. The first half presents the challenges in modern ‘divided-consciousness’ and its consequences of egoism, materialism, and hedonism on the one hand, and religious fanatism on the other. Eidelstein’s main audience is the Israeli secular public, to which he proposes an educational and philosophical middle-way rooted in sincere human and inter-human openness. This openness is inspired by the idea of disinterestedness that (...) Kant articulates in his Critique of Judgment. Eidelstein refers to additional authors, including Franz Rosenzweig and Emmanuel Levinas, to conceptualize the idea of open-mindedness. In the second half of the book, he engages classical American Pragmatism, specifically that of William James, in order to establish the possibility for, and the validity of, a humane open-mindedness. Pragmatism thus paves the way for accepting beliefs that may otherwise be excluded as superstitions and accords them a legitimate and productive role in the life of a modern individual. The difficulty, however, lies in Eidelstein’s employment of Kantian disinterestedness, for it is in fact seriously dissonant with the worthy pragmatic educational purposes that Eidelstein elaborates in the second half of his book. Pragmatism is opposed to disinterestedness in that it stresses the entanglement of fact and value, viewing interests as playing a necessary and productive part in moral motivation and action, while Kantian deontology eliminates consequentialism from the moral scope. While for pragmatists (for example John Dewey’s Democracy and Education) the human creature is holistically conceived, as made of flesh and blood and not only as ‘spirit’, Kant maintained the dualistic Cartesian tradition. This tension calls for a rigorous address. Since Eidelstein’s book is making an important claim about the place open-mindedness has within the Judaism, it must be noted that the disinterestedness of a presumed human ‘self’ is also not easily compatible with the dominant voices in normative Jewish tradition. The Bible does not deal to a large extent with the ‘self’ or with mental intentions, and its conception of the human is not categorically different in the Talmudic corpus. On the contrary, the rabbis frequently endorse pragmatic and ‘external’ reasons, as the motivational basis for action. The kind of purism associated with disinterestedness (as in Mishnah Avot 5:18-19) is barely represented in rabbinic thought. Openness and Faith: In Search of Cultural Education Here and Now is nevertheless an important contribution to the intellectual discourse over the individual and public virtues. In our ever-more segregated and fenced-off world, there is an urgency to delineating the virtue of openness, hoping that Ecclesiastes is right in contending that “No person has power over the spirit [רוח] to retain it” (8:8). But to make Eidelstein’s point about openness in the second half of his book educationally viable, there a need for a pragmatic refinement of the philosophical anthropology in its first half. One way or the other, Openness and Faith is praiseworthy for its articulateness and depth, which invites its readers to an open-minded conversation about the concept of openness. (shrink)

Layunin ng pananaliksik na ito na makabuo ng Gabay sa Pagtuturo (Teacher’s Guide) bilang kagamitang makatutulong sa pagkatuto ng asignaturang Filipino. Gamit ang deskriptibong pananaliksik, natuklasan na 81% ng mga guro ang nagsabing makatutulong ang paglikha ng Gabay sa Pagtuturo (Teacher’s Guide). Ayon naman sa 95% ng mga mag-aaral, nararapat isama ang mga gawaing kaugnay ng panonood upang mas maging interaktibo at epektibo ang pagkatuto ng nabanggit panitikan. Batay sa mga inilahad na kinalabasan, nabatid ng mananaliksik na malaking (...) bahagdan ng mga guro at mag-aaral ng asignaturang Filipino ang nagsasabing may kahirapan ang pagtuturo at pagkatuto ng Noli Me Tangere bilang akdang pampanitkan sa ikaapat na markahan ng ika-9 na baitang. Sa makatuwid, ang pagkakaroon ng Gabay sa Pagtuturo (Teacher’s Guide) ng nabanggit na Obra Maestra ay makatutulong nang malaki hindi lamang sa guro bagkus ay pati na rin sa mag-aaral. (shrink)

Ang papel na ito ay isang pilosopikong pagsusuri sa konsepto ng espasyo sa Pilipinong pananaw. Ang konsepto ng espasyo sa Pilipinong pananaw ay nagsisilbing dahilan para masabi nating tayo ay nagmamahal sa karunungang nagmula at pinagyaman ng kamalayang Pilipino. Ang konsepto ng espasyo rin ang nagpapatibay sa katwiran na naglalantad sa pangangailangan nang agarang pananaliksik ng karunungang nakaligtaan sa kanluran. Kung ang mga Hapon ay matagumpay na pinagmunihan ang 'espasyo' gamit ang mga konseptong basho, aidagara, at zettai mu tungo sa (...) pagbibigay diin sa pagkamakabayan, ang ‘espasyo’ ay magsisilbing gabay sa mga Pilipino na lumingon sa kanilang pinanggalingan upang bigyan ng linaw ang layunin sa bawat tangkang pagbuo ng masasabing makataong ‘pilosopiya natin’. Tungo sa makataong espasyo sa pag-iral ng tao, nais galugarin ng diskursong ito ang mga sumusunod na paksa: 1] Lugar ay Espasyo; 2] Sa Pagitan ng ‘Ako’ at ng ‘Ikaw’; 3] Espasyo Bilang Bukal ng Kaalaman at pagkatuto; 4] Pagbuo ng Makataong Espasyo at Pagbuwag sa mga Mapang-aping Espasyo; 5] Salaysay ng mga Karanasan Tungo sa paghulma ng Makataong Espasyo; 6] Espasyo ng/para sa mga Peminista?; 7] Sa Pagitan ng Namatay at ng Namatayan; 8] Saan Matatagpuan ang Kapayapaan? (shrink)

ALL THE MORE, by Avi Sion, Ph.D., comprises a merged list of 72 qal vachomer arguments in the Tanakh, i.e. of a fortiori arguments in the Hebrew Bible. This listing brings together lists proposed in past rabbinic literature and in more recent studies by the author. The literature research for it was carried out mainly by R. Yaakov Gabay, who looked into works in Hebrew by five rabbis who had proposed lists, namely: R. Shmuel Yaffe Ashkenazi (Yefeh Toar, 1597), (...) R. Zvi Hirsch Katzenellenbogen (Netivot Olam, 1822), R. Zeev Wolf Einhorn (Midrash Tannaim, 1839), R. Mattityahu Strashun (Mattat Yah, 1892), R. Chaim Hirschensohn (Berure HaMidot, 1928). The author of the present essay brought additional information from the Tanakh commentary of R. Shlomo Yitzchaki (Rashi, 11th Cent.) and an essay by R. Louis Jacobs (2005), as well as from his own past works (Judaic Logic, 1995, and A Fortiori Logic, 2013). The information thus gathered is here presented in a systematic manner, after careful evaluation by the author of each case with reference to narrative context, language used, and logical form. Efforts are made to identify which cases were known to each of the past authors, and to determine who found each case first and whether subsequent listings of the case (if any) were independent or derivative. (shrink)

FISIOLOGIA DA REPRODUÇÃO BOVINA: 2 - ESTRO E SERVIÇO -/- -/- INTRODUÇÃO -/- -/- A identificação de vacas em cio (estro ou cio) é, sem dúvida, a prática mais importante no manejo da reprodução do rebanho leiteiro. Apesar dos avanços no conhecimento da fisiologia da reprodução a nível celular e molecular, a identificação de vacas em estro continua sendo o problema reprodutivo mais importante e o que mais causa prejuízos econômicos. Na indústria de laticínios no Brasil, seu impacto não foi (...) estimado, porém, a estimativa feita por países como os Estados Unidos onde se perdem 300 milhões de dólares por ano pode dar uma ideia, atribuída apenas à baixa eficiência na detecção de estros. Por que é cada vez mais difícil detectar vacas em estro? A resposta está relacionada aos aspectos intrínsecos da vaca leiteira moderna, associadas as práticas de manejo dos rebanhos atuais, caracterizados por possuírem grande número de vacas nos plantéis. -/- -/- 2.1 Como saber que uma vaca está em cio/estro? -/- -/- O comportamento estral é causado por um aumento no estradiol sérico produzido pelo folículo ovulatório. O aumento do estradiol provoca mudanças de comportamento e modificações na genitália externa e interna. A vaca mostra-se inquieta, sua vocalização aumenta, ela anda mais, tenta montar em outras vacas e aceita montar no touro ou em outra vaca, bem como urinam com mais frequência (micção frequente). A vulva fica levemente inflamada, à palpação retal o útero pode ser visto com tônus ou turgor (duro e contraído) e ao massagear o colo do útero observa-se que sai abundante muco cristalino da vulva. O mecanismo clássico proposto na regulação do estro é baseado principalmente no papel do estradiol; no entanto, estudos recentes indicam que o GnRH pode participar da regulação do estro ao nível do hipotálamo. O estro possui duração entre 8 e 18 horas e a intensidade do mesmo é afetada por fatores ambientais e intrínsecos a vaca moderna (figuras de 1 a 6). -/- -/- -/- Figura 2: A observação do grupo sexualmente ativo facilita a identificação das vacas em estro. -/- Figura 1: As vacas em estro formam grupos ativos (grupo sexualmente ativo) separados do resto das vacas. A conformação desses grupos facilita a observação do estro. -/- -/- A formação de grupos de vacas é um fator ideal para a detecção de vacas em cio, elas ficam juntas e começam a montar uma nas outras, a cheirar a urina de ambas etc. comportamentos que podem ser visualizados de longe pelo tratador e diagnosticado o cio o mais breve possível para o manejo reprodutivo adotado pela propriedade seja para monta natural ou controlada e/ou inseminações artificiais (IA) e artificiais em tempo fixo (IATF). -/- -/- Figura 3: O único comportamento positivo do estro é a aceitação da monta de outra vaca. É frequente que a vaca que realiza a monta também esteja em estro, o que só será afirmado até que ela aceite a monta de outra vaca. -/- -/- Figura 4: Cada monta dura de 5 a 7 segundos -/- Figura 5: A vaca leiteira aceita de 5 a 30 montas distribuídas entre 8 e 18 horas. -/- Figura 6: Além das mudanças comportamentais, os estrogênios causam alterações na genitália interna. Uma delas é a produção de muco cervical, que juntamente com o turgor uterino, constituem os sinais genitais do estro. -/- -/- O cio pode ser dividido em três fases, a inicial, a fase de cio verdadeiro e a fase final. O cio verdadeiro quando é observado, é caracterizado pelo momento em que a vaca aceita claramente a monta. Por sua vez, os sinais de início e final de cio se misturam, apresentam nervosismo e inquietação, cheiram e lambem a vagina e a urina de outras vacas, apoiam a cabeça na garupa de outras fêmeas etc. (figura 7). Uma das sugestões adotadas nas propriedades para facilitar a identificação do cio em um rebanho é realizada pelos funcionários com a utilização de um bastão ou fita de coloração da garupa das vacas. -/- Figura 7: Principais sinais que demonstram que a vaca está entrando em cio. As imagens mostram o início do cio, cio verdadeiro e final do cio. -/- CONTINUA. BAIXE O PDF!!! -/- RESUMO -/- -/- < >Nos Estados Unidos, 300 milhões de dólares são perdidos devido à baixa eficiência na detecção do estro. A eficiência na detecção do estro no Brasil é de 40 a 50%. A meta de eficiência para detecção de estro é > 60%. Com a observação das vacas em dois períodos diários de três horas cada (manhã e tarde), consegue-se uma eficiência na detecção de estro de 80%. Menos de 20 por cento das vacas devem ter um intervalo de serviço duplo e nenhum de mais de 48 dias. A taxa de prenhez é obtida multiplicando-se a eficiência na detecção do estro pela porcentagem de concepção e dividindo por 100 (50 * 30/100 = 15%). A taxa de prenhez em rebanhos norte-americanos é de 15%. Nos Estados Unidos, para cada ponto percentual que diminui a taxa de prenhez, não há mais de US$ 12 a US$ 15 por vaca por ano. No Brasil, para cada ponto percentual que aumenta a taxa de prenhez, na faixa de 15 a 20%, é gerada uma renda anual adicional de $ 190 reais por vaca. Não mais que 25% das vacas devem estar vazias no 150º dia pós-parto. Não mais do que 8% devem as vacas ser cobertas no 250º dia pós-parto. 8% das vacas devem engravidar a cada mês. O estro ocorre 48 a 120 horas após o tratamento com PGF2α. 80% é a precisão na palpação do corpo lúteo. Quatorze dias devem decorrer entre duas injeções de PGF2α. Menos de 25% das vacas incluídas no programa de pré-sincronização devem chegar à IATF. No momento da ovulação, a primeira injeção de GnRH deve ser aplicada entre o quinto e o nono dia do ciclo estral. A inseminação cronometrada é realizada 14-16 horas após a segunda injeção de GnRH. O tratamento com dispositivos intravaginais liberadores de progesterona dura 12 dias. Se a duração do tratamento é menor deve-se injetar PGF2α ao retirá-lo. -/- -/- REFERÊNCIAS BIBLIOGRÁFICAS -/- -/- ATUESTA, Jorge; DIAZA, Angela Gonella. Control hormonal del ciclo estral en bovinos y ovinos. Spei Domus, v. 7, n. 14, 2011. -/- COLAZO, Marcos Germán; MAPLETOFT, Reben. Fisiología del ciclo estral bovino. Ciencia Veterinaria, v. 16, n. 2, p. 31-46, 2017. -/- Fisiologia Clínica do Ciclo Estral de Vacas Leiteiras: Desenvolvimento Folicular, Corpo Lúteo e Etapas do Estro. Belo Jardim: IFPE, 2020. -/- Fisiologia da Reprodução Animal: Ovulação, Controle e Sincronização do Cio. Belo Jardim: IFPE, 2020. -/- DOBSON, H. et al. The high‐producing dairy cow and its reproductive performance. Reproduction in domestic animals, v. 42, p. 17-23, 2007. -/- DO VALLE, Ezequlel Rodrigues. O ciclo estral de bovinos e métodos de controle. EMBRAPA-CNPGC., 1991. -/- FURTADO, Diego Augusto et al. Inseminação artificial em tempo fixo em bovinos de corte. Revista científica eletrônica de medicina veterinária, v. 16, p. 1-25, 2011. -/- GALON, Nadav. The use of pedometry for estrus detection in dairy cows in Israel. Journal of Reproduction and Development, v. 56, n. S, p. S48-S52, 2010. -/- HOPPER, Richard M. (Ed.). Bovine reproduction. John Wiley & Sons, 2014. -/- LOPEZ, H.; SATTER, L. D.; WILTBANK, M. C. Relationship between level of milk production and estrous behavior of lactating dairy cows. Animal reproduction science, v. 81, n. 3-4, p. 209-223, 2004. -/- MACMILLAN, Keith L. Recent advances in the synchronization of estrus and ovulation in dairy cows. Journal of Reproduction and development, v. 56, n. S, p. S42-S47, 2010. -/- MUNIS DE OLIVEIRA, G. Fisiologia da Reprodução Bovina e Métodos de Controle do Ciclo Estral. Trabalho de conclusão do curso de especialização em Reprodução e Produção de Bovinos–UCB. Rio de Janeiro, Brasil, 2006. -/- O'CONNOR, MICHAEL L. Estrus detection. In: Current therapy in large animal theriogenology. WB Saunders, 2007. p. 270-278. -/- RIPPE, Christian A. El ciclo estral. In: Dairy Cattle Reproduction Conference. 2009. p. 111-116. -/- ROELOFS, Judith et al. When is a cow in estrus? Clinical and practical aspects. Theriogenology, v. 74, n. 3, p. 327-344, 2010. -/- VIVEIROS, Ana Tereza de Mendonça. Fisiologia da reprodução de bovinos. Lavras: UFLA, p. 62, 1997. (shrink)