title: Seasonal variation of the ovarian function in unmated sows revealed by the measurement of progesterone and 17 beta-oestradiol in peripheral bloodplasma.
mesh_terms: D000818:Animals; D004958:Estradiol / Q000097:blood*; D005260:Female; D010053:Ovary / Q000502:physiology*; D011374:Progesterone / Q000097:blood*; D012621:Seasons; D013552:Swine / Q000097:blood / Q000502:physiology*
chemical_list: D011374:Progesterone; D004958:Estradiol