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In this study, the effects of experimentally induced hyperthyroidism and hypothyroidism on body weight and carcass in Japanese quails were investigated.
A total of 45 4-week old female Japanese quails were used. The quails were divided into 3 groups as control, hyperthyroid and hypothyroid group, with ¡5 quails in each.
0.2% propylthiouracil (PTU) was added into the diet of hypothyroid group, and 0.4 mg /I00 g levat-rocsyn- sodium was added into the diet of the hyperthyroid for 5 weeks. The birds in the control group were fed with unsupplemented commercial diet for 5 weeks.
The mean plasma T4 level increased statistically (P<0.01) in the hyperthyroid group while İt decreased significantly (P<0.01) in the hypothyroid group.
Body weight and carcass weights of hyperthyroid quails did not change in comparison with the control group. However these parameters increased significantly in the hypothyroid group (P<0.01).