Abstract
The objective of this study was to evaluate the replacement of corn silage by pressed citrus pulp (PCP) on carcass characteristics and non-carcass components of Santa Ines lambs. Twenty-four lambs with average age of 90 days and initial weight of 18 kg were maintained in feedlot for 67 days, fed with increasing levels of PCP replacing corn silage (0, 25, 50, 75%, DM basis). There was no difference (p>0.05) for live weight at slaughter (32.8 kg), hot carcass yield (44.7%), true yield (50.3%) and non-carcass components. In relation to cut yields, only loin yield was affected (p<0.05) by the diet, which showed quadratic response. For the carcass measurements, only the arm length was affected by the diet, showing quadratic behavior. The percentage of fat and muscle showed quadratic behavior according to replacement levels. The results suggest that pressed citrus pulp can substitute corn silage for lambs in feedlot without affecting the carcass characteristics and the non-carcass components.
Highlights
Em qualquer tipo de criação animal é notória a importância dos custos de produção, uma vez que a lucratividade depende diretamente dos gastos com mão-de-obra, alimentação, equipamentos e insumos em geral
The results suggest that pressed citrus pulp can substitute corn silage for lambs in feedlot without affecting the carcass characteristics and the non-carcass components
ZUNDT, M. et al Características de carcaça de cordeiros terminados em confinamento, com dietas contendo diferentes níveis protéicos
Summary
O experimento foi realizado no Setor de Ovinocultura do Departamento de Zootecnia, da Universidade Estadual de Londrina (UEL), Londrina, Estado do Paraná, durante o período de setembro a novembro de 2004. Foram utilizados 24 cordeiros machos inteiros da raça Santa Inês, com idade média de 90 dias e peso vivo inicial médio de 18,44 kg. Os tratamentos experimentais constituíram-se de quatro níveis de substituição da silagem de milho pela polpa cítrica. Úmida prensada, sendo 0, 25, 50, 75% da matéria seca. Na Tabela 1, consta a composição percentual e química das rações experimentais. Composição percentual dos ingredientes das dietas (% da MS) e teores médios de matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), extrato etéreo (EE), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA), carboidratos totais (CHO), carboidratos não fibrosos (CNF), matéria mineral (MM) e nutrientes digestíveis totais (NDT) das dietas experimentais
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