the effect of elevated plasma concentrations of estradiol-17 beta ( e2 beta ) , estrone ( e1 ) and progesterone ( p ) , in concentrations similar to those observed at the end of pregnancy , on the gonadotropin releasing hormone ( gnrh ) -induced luteinizing hormone ( lh ) release in postpartum dairy cows was studied .
C0033308
progesterone
C0032961
pregnancy