Performance, carcass traits and meat quality of lambs fed coffee hulls treated with calcium oxide

• Ano de defesa: 2019
• Autor(a) principal: Nunes, Cris Luana de Castro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa
• Palavras-chave em Português: Cordeiros - Alimentação e rações; Resíduos agrícolas como ração; Óxido de cálcio; Cordeiros - Carcaças; Cordeiros - Registros de desempenho; Carne de ovelha - Qualidade; Produção Animal
• Link de acesso: http://locus.ufv.br//handle/123456789/26068

The objective of this study was to evaluate the effects of replacing corn silage by coffee hulls treated with calcium oxide (CaO) on growth performance, carcass traits and meat quality parameters of lambs. Twenty-eight crossbred, non-castrated male lambs, weaned at three months of age with average initial body weight of 20.24 ± 2.40 kg were housed in individual pens. Lambs were randomly assigned to one of the four experimental treatments, which consisted of different concentration levels of treated coffee hulls (0; 80; 160 e 240 g/kg on DM basis) as a substitute of corn silage. The forage:concentrate ratio of the experimental diets was 50:50 on dry matter (DM) basis and the diets were formulated to supply nutrient requirements of growing lambs with average daily gain of 200 g. After 66 days of experimental period, lambs were slaughtered for further carcass traits and meat quality evaluation. As results, increasing levels of treated coffee hulls in the diets led to a quadratic effect on intake of DM and its components (P < 0.05), values were highest at the intermediate addition level. Moreover, as level of coffee hulls increased in the diets, both DM and crude protein (CP) apparent digestibility declined linearly (P = 0.001). However, apparent digestibility of neutral detergent fiber corrected for ash and protein contents (apNDF), ether extract (EE) and non-fiber carbohydrates (NFC) were not influenced by treatments (P > 0.05). Values of final body weight and average daily gain (ADG) were similar up to 160 g/kg of corn silage replacement. A quadratic effect was observed for shear force (WBSF) (P = 0.029), the only meat quality parameter that showed significant effect. Lower values of WBSF were observed at the intermediated levels of corn silage replacement. Coffee hulls treated with CaO can be used as corn silage substitute in levels up to 160 g/kg because lambs’ performance and meat quality are not affected.