Composição tecidual do lombo e da perna de cabritos F1 (Boer X SPRD) terminados em pastagem nativa com diferentes níveis de suplementação.

Abstract

Tissue composition of loin and leg of F1 goats (Boer X SPRD) finished on native pasture with different levels of supplementation. The present study aimed to evaluate the effect of supplementation on the physical composition of the loin and leg of twenty crossbred F1 goats (boer x SPRD), not castrated, with initial live weight (LW) of 15 kg and 120 days of age, finished in native pasture and increasing levels of supplementation (0; 0.5; 1.0 and 1.5% BW on dry matter). The concentrate was designed to meet a daily gain of 200 grams for the highest level of supplementation. The animals were slaughtered and each carcass was cut in half, the loin and leg being removed and dissected into bone, muscle and fat. Supplementation exerted a positive linear effect on the weights of the loin, longissimus dorsi, muscle and intermuscular fat, on the weight and total fat yield, but on the relationship: fat and negative linear effect and did not influence the other variables. There was also a positive linear effect on the weights of the leg, muscle, bone and intermuscular fat, on the weight and yield of fat and subcutaneous fat, but on the muscle:fat ratio the effect was linearly negative and did not influence the other variables. The weight of the semitendinosus, adductor, biceps and quadriceps muscles was positively influenced by the supplementation, while the semimembranosus was not affected, as was the performance of all of them. To produce carcasses with heavier loins and legs and with greater participation of muscle and fat, supplementation is recommended.