Chicken endocrinal reactions towards thermal conditions in the environment
Witkowski, A. | Podgorski, W. | Studzinski, T.(Akademia Rolnicza, Lublin (Poland). Wydzial Biologii i Hodowli Zwierzat)
The experiment was carried out using Astra broilers divided into 3 groups and subjected to different environmental temperature from the 21st day of life. Group 1 was treated with 12-15 deg C, group 2 with 18-22 deg C, and group 3 with 26-29 deg C. Blood was taken at the 28th, 35th, 49th and 56th day of the chickens' life. Insulin, triiodotyronine (T3) and thyroxine (T4) levels were recorded in blood serum using IBJ tests. Along with the time course, decrease of insulin level was observed in blood serum. Different temperatures also affected the insulin content. The lowest insulin level was found in chickens treated with low environmental temperature (12-15 deg C), and the highest at high temperature (26-29 deg C). The decrease in triiodotyronine (T3) content was observed in the blood serum of chickens depending on their age, variable temperature and time period. Thyroxine (T4) content in blood serum of chickens subjected to different environmental temperature conditions also changed due to age and various temperature ranges applied. Conclusions on the effects of extreme environmental temperature on endocrinal activity of broiler-chickens were made
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