Pro-oestrous surge in plasma progesterone in the cow.
D000818:Animals; D002417:Cattle; D004958:Estradiol / Q000097:blood; D004971:Estrus; D005260:Female; D007774:Lactation; D011247:Pregnancy; D011374:Progesterone / Q000097:blood*; D013997:Time Factors
D011374:Progesterone; D004958:Estradiol