Medidas objetivas e composição tecidual da carcaça de cordeiros alimentados com diferentes níveis de energia em creep feeding
Data
2003-12-01
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Editor
Sociedade Brasileira de Zootecnia
Resumo
O trabalho foi desenvolvido no Setor de Ovinocultura da Universidade de Marília, SP, objetivando avaliar o efeito dos três níveis de energia (2,6; 2,8 e 3,0 Mcal EM/kg MS) sobre as medidas objetivas das carcaças e do lombo, pesos e rendimentos dos cortes, além da composição tecidual e musculosidade da carcaça de cordeiros alimentados em creep feeding. As rações foram isoprotéicas (18,50% PB), fornecidas ad libitum, duas vezes ao dia. Os cordeiros permaneceram com as ovelhas até o abate, quando atingiam o peso preestabelecido de 31 kg. Posteriormente, os animais foram submetidos a jejum alimentar, registrando-se o peso vivo ao abate. Durante o resfriamento na câmara de refrigeração a 5ºC, por 24 horas, as carcaças foram penduradas pelas articulações tarso metartasiana, distanciadas em 17 cm; sendo em seguida mensuradas. As carcaças foram seccionadas ao meio e a metade esquerda dividida em sete regiões anatômicas (paleta, perna, lombo, costelas falsas, costelas verdadeiras, baixo e pescoço), possibilitando o cálculo dos pesos e rendimentos dos cortes. Posteriormente, efetuou-se as mensurações no músculo Longissimus dorsi e a perna esquerda foi dissecada e determinados os pesos dos músculos, da gordura e dos ossos, além de calculado o índice de musculosidade. Os resultados revelaram diferenças significativas para as medidas de profundidade do tórax, peso e rendimento das costelas verdadeiras e gordura intermuscular da perna, sendo que o nível de 3,0 Mcal em na ração proporcionou os melhores resultados, para cordeiros Suffolk alimentados e terminados em creep feeding.
The experiment was carried out at Sheep Production Department, Universidade de Marília-SP, to evaluate the effect of energy levels (2.6, 2.8 and 3.0 Mcal ME/kg DM) on objective measures of carcasses and loin, cuts weight and yield and tissue composition and muscularity of carcasses of lambs under creep feeding. Isoprotein rations (18.50 %CP) were fed ad libitum, twice a day. Lambs stayed with their dams until slaughter weight ( 31 kg). After, lambs were fasted, when slaughter live weight was recoded. During cooling at 5ºC by 24 h, carcasses were hanged by tarse-metartase articulation, distanced by 17 cm, and, then, were measured. Later, carcasses were sectioned and the left side was divided in seven anatomical parts (shoulder, leg, loin, true ribs, false ribs, breast point and neck) to calculate weight and yield of cuts. Then, muscle Longissimus dorsi was evaluated. Left leg was dissected and it was considered muscle, fat and bone weights. Muscularity index was figured out. Results showed significant differences for thorax depth, true ribs weight and yield, and leg intermuscular fat. It was concluded that ration with 3.0 Mcal ME favored better results for Suffolk lambs fed and finished in creep feeding.
The experiment was carried out at Sheep Production Department, Universidade de Marília-SP, to evaluate the effect of energy levels (2.6, 2.8 and 3.0 Mcal ME/kg DM) on objective measures of carcasses and loin, cuts weight and yield and tissue composition and muscularity of carcasses of lambs under creep feeding. Isoprotein rations (18.50 %CP) were fed ad libitum, twice a day. Lambs stayed with their dams until slaughter weight ( 31 kg). After, lambs were fasted, when slaughter live weight was recoded. During cooling at 5ºC by 24 h, carcasses were hanged by tarse-metartase articulation, distanced by 17 cm, and, then, were measured. Later, carcasses were sectioned and the left side was divided in seven anatomical parts (shoulder, leg, loin, true ribs, false ribs, breast point and neck) to calculate weight and yield of cuts. Then, muscle Longissimus dorsi was evaluated. Left leg was dissected and it was considered muscle, fat and bone weights. Muscularity index was figured out. Results showed significant differences for thorax depth, true ribs weight and yield, and leg intermuscular fat. It was concluded that ration with 3.0 Mcal ME favored better results for Suffolk lambs fed and finished in creep feeding.
Descrição
Palavras-chave
cortes, ovinos, Suffolk, musculosidade, cuts, muscularity, sheep, Suffolk
Como citar
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 32, n. 6, p. 1380-1390, 2003.