A study was completed on the effects of heat stress on growth, carcass composition, and feeding behavior offinishing barrows without the compounding effect of a reduced feed intake. Sixty Large White Landrace barrows (65.2 0.5 kg) were randomly assigned to one of five treatments: control, two levels of temperature imposed feed intakerestriction (13% HS, 26% HS), and two levels of manual feed intake restriction at thermoneutral (13%TN, 26% TN).Feeding behavior was monitored continuously in the control, 13% HS, and 26% HS treatment groups. Weekly weights andbi-monthly ultrasound backfats were taken. The pigs were slaughtered at a treatment average weight of 107.5 kg. Theoffal and the left half of the carcass were ground separately and analyzed for protein, fat, water, and ash. The 26% HStreatment group was found to have significantly higher fat deposition and lower protein deposition than the 26% TNtreatment group (P < 0.05). Ultrasound backfat indicated similar trends in carcass fat and protein differences. Resultssuggest that high-lean-growth pigs reared in hot environments deposit more fat and less protein than those raised in athermoneutral environment and fed similar amounts.
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Brown-Brandl et al. (2000) studied this question.
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