title: Circadian rhythm of plasma prolactin in heifers.
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D002940:Circadian Rhythm; D004971:Estrus; D005260:Female; D011247:Pregnancy; D011388:Prolactin / Q000097:blood*
chemical_list: D011388:Prolactin