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Six Hereford x Angus (252 kg) and six Brahman x Angus steers (261 kg) were used to compare metabolic heat production at 0, 5, and 15 C. The steers were divided into three groups with two Hereford x Angus and two Brahman x Angus steers per group. A Latin Square design was used so that each group was exposed to each temperature for 5 wk (1 wk acclimation + 4 wk data collection). Heat production was determined once per week for each steer. Steers were individually fed daily a 13% CP diet containing 72% cracked corn (DM basis) to produce a gain of .68 kg/d in thermoneutral conditions. No gain or feed efficiency differences were observed with respect to breed and temperature (P=.55 and P=.40, respectively). Heat production (kcal·kg−75·d−1) was greater (P<.05) and 0 and 5 C (158.4 ± 4.5 and 168.9 ± 4.5) than at 15 C (137.0 ± 4.5). Brahman x Angus steers appeared to produce more heat when breed was the main effect (P =.21). However, no trends were observed in metabolic heat production when breed by temperature interactions were considered (P=.70).
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