In this study, we evaluated the tissue composition, the ratios between different issues, and the allometric growth of tissues from the commercial cuts neck, shoulder, rib, and leg, and of the carcass of Texel lambs. Thirty uncastrated male lambs born from single calvings were used in this experiment. Lambs were weaned, confined individually, and distributed into five treatments with six replications. Each treatment consisted of a predefined slaughter weight (T23 -initial slaughter, T25, T30, T35, and T40). The proportion of bone decreased linearly in the shoulder, rib, and legs, but remained constant in the neck. The proportion of muscle decreased in the rib, whereas in the other cuts it remained constant. The percentage of fat increased as the slaughter weight of the lambs was increased, for all cuts. In all cuts and in the carcass, bone and muscle showed early growth (b<1), whereas fat displayed late growth (b>1). The proportion of bone decreased and fat increased linearly in the carcass, and the proportion of muscle was not influenced by the slaughter weight of the lambs. The muscle/fat ratio decreased in all cuts, and consequently in the half-carcass, as the slaughter weight was increased. The muscle/ bone ratio increased in the shoulder, rib, leg, and half-carcass, but there was no significant effect on the neck. The bone and muscle tissues showed early growth, whereas the fat had late growth in the different commercial cuts and carcass of Texel lambs. The tissue growth pattern of the shoulder may be representative of the allometric growth of the different carcass tissues. An increase in the slaughter weight of Texel lambs leads to a reduction of the muscle/fat ratio, due to the higher deposition of fat in the carcass of these animals. ResumoAvaliou-se a composição tecidual, a relação existente entre os diferentes tecidos e o crescimento alométrico dos tecidos dos cortes comerciais pescoço, paleta, costilhar e perna e da carcaça de cordeiros da raça Texel. Foram utilizados 30 cordeiros machos, não castrados e nascidos de parto simples. Os cordeiros foram desmamados, confinados individualmente e distribuídos em cinco tratamentos com seis repetições, sendo cada tratamento um peso pré-estabelecido de abate (T23 -abate inicial, T25, T30, T35 e T40). A proporção de osso diminuiu linearmente na paleta, no costilhar e na perna e se manteve constante no pescoço. A proporção de músculo diminuiu apenas no costilhar, enquanto que nos demais cortes se manteve constante. A porcentagem de gordura aumentou com a elevação do peso de abate dos cordeiros, em todos os cortes realizados. Em todos os cortes e na carcaça, o osso e o músculo apresentaram crescimento precoce (b<1), enquanto que a gordura apresentou crescimento tardio (b>1). A proporção de osso diminuiu e a de gordura aumentou linearmente na carcaça, enquanto que a proporção de músculo não foi influenciada pelo peso de abate dos cordeiros. A relação músculo/gordura diminuiu em todos os cortes e, consequentemente, na meia carcaça com o aumento no peso de ab...
RESUMOEste estudo teve como objetivo avaliar a proporção em relação ao peso de corpo vazio; e o crescimento alométrico dos componentes não constituintes da carcaça de cordeiros da raça Texel terminados em confinamento e abatidos com diferentes pesos. Foram utilizados 30 cordeiros machos, não castrados e nascidos de parto simples. Os cordeiros foram desmamados com aproximadamente 50 dias de idade, confinados individualmente e distribuídos em cinco tratamentos com seis repetições, sendo cada tratamento um peso pré-estabelecido de abate (T23 -abate inicial, T25, T30, T35 e T40 kg de peso vivo). As proporções de pulmão+traquéia, abomaso, intestino delgado, intestino grosso, cabeça e patas diminuíram e a proporção de testículos aumentou linearmente de acordo com o incremento no peso de abate dos cordeiros. Os componentes corporais fígado, diafragma, rúmen, retículo, omaso, pele, língua, testículos, gordura interna e gordura renal, apresentam desenvolvimento tardio. De forma inversa, pulmão+traqueia, esôfago, coração, pâncreas, rins, baço, abomaso, intestino delgado, intestino grosso, sangue, cabeça, patas e pênis, são componentes corporais que apresentam desenvolvimento precoce. Palavras-chave: confinamento, órgãos, ovinos, vísceras Proportion and allometric growth of the non-carcass components of lambs Texel slaughtered at different weights ABSTRACTThe objective of this study was to evaluate the proportion regarding the empty body weight, and the allometric growth of noncarcass components of Texel lambs finished in feedlot and slaughtered at different weights. It was used 30 male lambs, noncastrated and simple delivered. The lambs were weaned at 50 day-old, individually confined and distributed in five treatments with six repetitions and each treatment with a predetermined slaughter weight (T23 -initial slaughter, T25, T30, T35 and T40 kg body weight). The proportions of lung+trachea, abomasum, small intestine, large intestine, head and legs decreased and the proportion of testicles increased linearly according to the improvement on the slaughter weight of lambs. The body components as liver, diaphragm, rumen, reticulum, omasun, skin, tongue, testicles, internal fat and kidney fat present late development. On the other way, lung+trachea, esophagus, heart, pancreas, kidneys, spleen, abomasum, small intestine, large intestine, blood, head, feet and penis are body components that present early development.
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