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Two trials involving 480 Cobb color-sexed broiler chicks were conducted to determine the effect of various constant ambient temperatures on the performance of broilers. Temperatures in Trial 1 were 18 and 29 C and in Trial 2 were 24 and 35 C. The interacting effect of dietary energy (3.142 or 3.252 kcal ME/g of diet) and protein (16, 19, or 22%) on performance criteria was also examined within each trial. There was no indication of selective consumption of any of the ratios at any temperature. Differences in feed consumption observed in either trial were totally contributed by temperature effect. Within a trial, and irrespective of temperature treatment, the rate of growth and feed consumption of the females were less than that of the males. Males and females responded equally to the ambient temperature; there was no significant sex X temperature interaction in Trials 1 or 2.

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