Composição corporal e exigências proteicas e energéticas de caprinos nativos na caatinga

Abstract

The objective was to assess body composition and net requirements protein and energy for weight gain of indigenous goats. We used 34 animals castrated BW with 19,0 ± 0,35 kg, four months old, distributed in treatment: P- pasture without supplementation; + PJ – pasture + hay Jitirana; PM - pasture + hay Mororó; PMPF - pasture + 50% hay Mororó + 50% cactus (Nopalea cochenillifera (L.) S.D.) and PJPF - pasture + 50% hay Jitirana + 50% cactus (Nopalea cochenillifera (L.) S.D.), supplemented with 1% of your BW. In the end the animals were slaughtered and body composition and empty body weight (EBW). The contents of protein and energy in the body of animals from each treatment, and all treatments together, was estimated by means of nonlinear equations of energy and protein content of the remaining animals and references, depending on the EBW. By deriving these equations, we obtained the prediction of the net requirement for protein and energy gain of empty body weight (EWG). There were significant differences in body composition of water and fat. The overall equations to predict the net requirements of protein and energy for weight gain of goats native Caatinga were NPg = 0,4782 * EBW-0.0789 and NEg = 2.3405 * EBW 0.0219. The body content of protein decreased with increasing BW, unlike the increased energy according to the equation joint. The protein and energy requirements for native goats grazing in the Caatinga are higher than for animals in confinement.