The positive significant effect of these treatments was observed mainly in single pregnant ewes; this observation was correlated with a significant increase of milk yields during machine milking when r!-3 cestradiol was injected to sheep selected for their low plasma œstrogen levels during pregnancy. Hormonal treatments at the end of pregnancy, increasing plasma levels of prolactin, thyroxin and corticoids, were without effect on milk yields during machine milking for 2 8 days.
No takes yet. Share an insight, caveat, or question.
Poindron et al. (1977) studied this question.