Abstract

Abstract The objective of this study was to evaluate the growth performance and carcass characteristics of the Bonga sheep supplemented with noug seed cake (NSC; Guizotia abyssinica) with dried mulberry leaf meal (DMLM; Morus indica) and higher protein Vernonia amygdalina leaf (DVLM) meal mixtures maintained on Desho (Penisetum glaucifolium) grass hay ad libitum. The five experimental diets were 100% NSC (T1), 75% DMLM+25% DVLM (T2), 100% DMLM (T3), 50% DVLM+25% NSC (T4) and 100% DVLM (T5). Thirty lambs at the age of eight months with an initial body weight (BW) 15.63±1.4 kg were assigned in randomised complete block design with six replications to each experimental diet. The intake of crude protein, ash, neutral detergent fibre, and acid detergent lignin were significantly (P<0.0001) different for animals fed T2, and dry matter intake (DMI), total dry matter intake (TDMI), total dry matter intake as % of body weight (TDMI %BW) and total dry matter intake of metabolic body weight was relatively higher for T3 (P<0.0001). There was a significant (P<0.05) effect on slaughter body weight among treatments which was higher for sheep fed T2 and T3, at 25.7 kg each. There was no effect (P>0.05) on other carcass traits, edible or non-edible offal components. Total DMI was strongly and positively correlated with carcass traits and crude protein intake was positively correlated with body weight. Total replacement with DMLM and the mix of 75% DMLM + 25% NSC with Desho grass hay can be used to give better growth performance and carcass yield of lambs.