Zmiany poziomu jodotyronin w osoczu krwi rosnacych przepiorek japonskich otrzymujacych rewers trojjodotyronine

It has been established that 3.3’, 5-triiodothyronine (Тз) acts hipermetabolically, whereas 3’3.5’-triiodothyronine (reverse Тз, гТз) acts hypometabolically. The normal ratio of Тз to гТз in domestic fowls fluctuates around 10. Since the excess of Тз may promote catabolic processes and lo­wer weight gain, the aim of this experiment was to find the optimal ratio of Тз:гТз in blood plasma which corre­sponds with the greatest weight gain in Japanese quail. Reverse Тз was given in drinking water (1 pg гТз/ml) for 3, 10, 20 or 30 days. It has been found that Тз/гТз ratio of about 5, after 20 days of гТз administration, stimulated the weight gain of Japanese quail of both sexes from 7 to 44% with more pronounced effect in female birds.