Abstract
Thirty-two Anglo-Nubian crossbred castrated male goats were utilized in a completely randomized design to evaluate the effect of replacing corn with soybean hull in diets based on cactus forage (Nopalea cochenilifera Salm Dyck) at levels of 0, 33, 66 and 100%, measured for intake and carcass yield. The rise in soybean hull levels increased neutral detergent fiber intake linearly (p < 0.05) and reduced the intake of non-fiber carbohydrates. However, live slaughter weight, empty body weight, freezing losses, hot carcass weight and yield, cold carcass and “buchada” (gut) were not influenced. Fasting losses presented quadratic behavior (p < 0.05) while true and freezing yields increased linearly (p < 0.05). The carcass compactness index, the cuts and their respective yields were not influenced by the replacement of corn with soybean hull level, except for the shoulder cut, which presented quadratic behavior (p < 0.05). Total replacement of corn reduced feeding costs by 15.4%. Soybean hull can represent an alternative in the feeding of goats in confinement fed a cactus forage-based diet.
Highlights
O sistema de produção de ruminantes predominante no Nordeste é o extensivo
completely randomized design to evaluate the effect of replacing corn with soybean hull in diets based on cactus forage
their respective yields were not influenced by the replacement of corn
Summary
O experimento foi conduzido no Departamento de Zootecnia da Universidade Federal Rural de Pernambuco, região metropolitana do Recife, microrregião fisiográfica do Litoral Mata, Estado de Pernambuco. As dietas experimentais foram isoproteicas, sendo a dieta base formulada para atender às exigências para mantença e permitir ganho em peso médio de 150 g dia-1 (Tabela 1), de acordo com as exigências preconizadas pelo NRC (1981). Registraram-se os pesos de carcaça quente (PCQ), incluindo rins e gordura pélvico-renal. Determinou-se o peso do corpo vazio (PCVZ) pela diferença entre o PVA e o conteúdo do trato gastrintestinal (CTGI), assim sendo o TGI foi pesado cheio e vazio, visando determinar o rendimento verdadeiro (RV = PCQ/PCVZ x 100) (Mattos, 2005). Órgãos (fígado, rins, aparelho respiratório, língua, coração) e vísceras (rúmen/retículo, omaso, abomaso, intestino delgado e intestino grosso) foram pesados, sendo as vísceras esvaziadas, lavadas e novamente pesadas, para mensuração dos constituintes-não-carcaça e determinação do rendimento de “buchada” (Santos et al, 2006). O modelo foi escolhido de acordo com o comportamento biológico
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