[The effect of synthetic thyroliberin on lactation in cows]

Synthetic thyroliberine increased the thyroxin concentration in the blood of lactating cows. Thyroliberine administration twice a day during 15 days (5 micrograms per kg) in cows on the 4th, 6th and 8th months of lactation increased the milk productivity for 17 days by 9.2, 14.9 and 8.3 per cent, resp. The milk protein and lipid content did not essentially change.