title: Progesterone concentration in blood of mares during the estrous cycle, pregnancy and after hysterectomy.
mesh_terms: D000818:Animals; D002369:Castration; D002850:Chromatography, Gel; D004971:Estrus; D005260:Female; D006736:Horses / Q000097:blood* / Q000502:physiology; D007044:Hysterectomy; D008722:Methods; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood*; D011863:Radioimmunoassay; D014316:Tritium; D014599:Uterus / Q000502:physiology*
chemical_list: D014316:Tritium; D011374:Progesterone