title: Immunization of ewes to oestrogens: effects on the oestrous cycle and parturition.
mesh_terms: D000818:Animals; D004967:Estrogens / Q000276:immunology / Q000502:physiology*; D004971:Estrus; D005260:Female; D007743:Labor, Obstetric; D011247:Pregnancy; D012756:Sheep / Q000502:physiology*
chemical_list: D004967:Estrogens