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[The effect of exogenous somatotropin on the content of lactogenic hormones in the blood and milk secretion].

The effects of long-term (two lactation) injection of recombinant methionyl bovine somatotropin (bST) were investigated on 40 primiparous cows of Holstein breed. The increasing of milk yield was 1.1-4.4 kg/cow/day with no milk quality changes. The intensity of individual cow's response to bST was affected by the dose of bST and the type of nervous system. Other than an elevation in circulating ST levels, few significant changes occurred in morphological and biochemical parameters of blood serum. Prolactin, insulin, cortisol, thyroxin, triiodothyronine were all well within the expected physiological ranges both during and after cessation of bST treatment.