The experiment was carried out on the 37 Red-and-White heifers. Thyroxine (T^) and triiodothyronine (T, ) were measured in blood serum by specific double antibody radioimmunoassay. Blood samples were taken at about 90,270,450,540 days age and during the mating period also. The results indicate a positive correlation of concentration T, in blood serum at day of age with milk yield r=0,337.This relationship in cows producing 4048 kg of milk was r=0,686 but in cows producing 2963 kg of milk was not significant r=0,035.There were not significant correlation between the level of T, in blood serum and the future milk yield.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 124–127, 1986
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