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Abstract
Research was conducted to determine the effect of nicarbazin fed for 28 days on broiler performance and rectal temperature at two levels of RH: 35-50% and 65-75%. Nicarbazin treatment significantly decreased broiler body weights, weight gain, and feed consumption and significantly increased FCR compared to those fed the control diet (P<0.05). Seven days after nicarbazin was removed from the diet, there were no differences in weekly weight gain, but the nicarbazin treatment group had a significantly lower FCR compared to control birds (P<0.05). Elevated RH, 65-75% vs. 35-50%, was not found to influence broiler performance nor exacerbate nicarbazin related performance issues. Body temperature was not affected by nicarbazin under these environmental conditions.