title: Circa-annual rhythms of prolactin secretion in ewes and the effect of pinealectomy.
mesh_terms: D000818:Animals; D002369:Castration; D005260:Female; D007044:Hysterectomy; D008027:Light; D010507:Periodicity; D010870:Pineal Gland / Q000502:physiology*; D011247:Pregnancy; D011388:Prolactin / Q000097:blood / Q000378:metabolism*; D012756:Sheep / Q000502:physiology*; D013696:Temperature
chemical_list: D011388:Prolactin