Characteristics of estrus, diestrus, and ovulation in mares and effects of season and nursing.
D000367:Age Factors; D000818:Animals; D004971:Estrus; D005260:Female; D006736:Horses / Q000502:physiology*; D007774:Lactation; D009929:Organ Size; D006080:Ovarian Follicle / Q000033:anatomy & histology; D010053:Ovary / Q000033:anatomy & histology; D010060:Ovulation; D011247:Pregnancy; D012621:Seasons; D013997:Time Factors