Spontaneous prolongation of luteal activity in the mare.
D000818:Animals; D003338:Corpus Luteum / Q000502:physiology*; D004971:Estrus; D005260:Female; D006736:Horses / Q000502:physiology*; D010060:Ovulation; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D012621:Seasons; D013997:Time Factors
D011374:Progesterone