The lack of relationship between plasma progesterone levels and number of embryos and their survival in the pig.
D000818:Animals; D002369:Castration; D003338:Corpus Luteum; D004622:Embryo, Mammalian; D004967:Estrogens / Q000097:blood; D005260:Female; D005313:Fetal Death / Q000097:blood; D008098:Litter Size; D011247:Pregnancy; D011374:Progesterone / Q000097:blood*; D013480:Superovulation; D013552:Swine / Q000097:blood*
D004967:Estrogens; D011374:Progesterone