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vol.28 issue3Digestible energy levels for swines from 30 to 60 kg maintained in a thermoneutral environmentPerformance and characteristics of carcass of broiler chickens submitted to feed restriction in different periods author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598

Abstract

TAVARES, Sandra Lúcia da Silva et al. Digestible energy levels for barrows from 30 to 60 kg maintained in a high environment temperature. R. Bras. Zootec. [online]. 1999, vol.28, n.3, pp.577-582. ISSN 1516-3598.  https://doi.org/10.1590/S1516-35981999000300020.

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.

Keywords : growth; heat stress; requirement; performance; carcass composition.

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