Digestible energy levels for barrows from 30 to 60 kg maintained in a high environment temperature

[摘要] With the objective to evaluate the effects of digestible energy (DE) on the performance and carcass composition rate, 50 barrows, from 30 to 60 kg PV, maintained in a high temperature environment (32.00 ± .88°C) were used. A completely randomized block design with five treatments (3100, 3250, 3400, 3550, and 3700 kcal of DE/kg of diet), five replicates and two animals per experimental unit was used. The dietary DE level influenced, in a quadratic way, the daily weight gain and the feed, energy and protein intakes of the animals. Feed:gain ratio linearly improved with increasing dietary DE levels. The DE level did not influence the protein deposition rate, but the fat deposition increased linearly. The best results of weight gain were obtained with the estimate level of 3486 kcal DE, while the level of 3700 kcal DE provided the best results of feed:gain ratio.

[学科分类] 兽医学

[关键词] growth;heat stress;requirement;performance;carcass composition    Introdução A reação do suíno ao estresse de calor envolve respostas fisiológicas e comportamentais que influenciam o desempenho produtivo animal;como redução no consumo voluntário de alimentos;perda de peso e mobillização da gordura corporal