Nutrition and ovarian activity of mares early in the breeding season.
D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001947:Breeding; D004971:Estrus; D005260:Female; D006736:Horses / Q000502:physiology*; D006080:Ovarian Follicle / Q000033:anatomy & histology; D010053:Ovary / Q000033:anatomy & histology / Q000502:physiology*; D010060:Ovulation; D006109:Poaceae; D011247:Pregnancy; D012621:Seasons