Ovarian changes during the estrous cycle and pregnancy in mares.
D000818:Animals; D003338:Corpus Luteum / Q000033:anatomy & histology / Q000502:physiology; D004971:Estrus; D005260:Female; D005306:Fertilization; D006736:Horses / Q000502:physiology*; D006080:Ovarian Follicle / Q000033:anatomy & histology / Q000502:physiology; D010053:Ovary / Q000033:anatomy & histology / Q000502:physiology*; D010060:Ovulation; D011247:Pregnancy; D011270:Pregnancy, Animal