two hundred eighteen ewes were used in experiments 1 ) to develop a progesterone supplementation regimen capable of sustaining serum concentrations of progesterone at about 2.0 ng/ml for a period of 50 d ( exp . 1 ) and 2 ) to determine the effects of progesterone supplementation ( d 6 to 50 after mating ) on pregnancy and embryo survival rates in mated ewes ( exp . 2 ) .
C0033308
progesterone
C0032961
pregnancy