Effects of Seasonal Change in the Thermal Environment on Physiological Responses of Unsexed Broilers to Dietary Supplementation of Antithyroid Drug Carbimazole

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Mohamed, Abdalla
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The objective of this study was to evaluate the physiological responses of the unsexed broilers to dietary supplementation of carbimazole (0.1 g/bid/day) during tropical summer and winter conditions. There were marked changes in. most of the parameters investigated. The rectal temperature (Tr) was higher (P<0.05) in summer compared to the winter values in both groups, supplementation of carbimazole caused a decrease (P<0.01) in (Tr). The mean values of food intake and body weight (BW) were lower (P<0.05) in summer in both groups. Supplementation of carbimazole caused decreases in the mean food intake in both seasons (P<0.05) and a decrease in. the mean B.W. only in. winter ter (P<0.05). The plasma glucose concentration was lower (P<0.05) in summer and supplementation of carbimazole caused a decrease (P<0.05) in. the plasma glucose level only in win. ter. The serum cholesterol concentration was lower (P<0.05) in. summer and in. both seasons supplementation of carbimazole caused an increase (P<0.05) in serum cholesterol concentration.
This paper had been presented for promotion at the university of Khartoum.
Broiler • Season Carbim azole • Thermoregulation • Blood constituents