title: Reproductive activity of the cow in the post-partum period. I. Factors affecting the length of the post-partum acyclic period.
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle / Q000502:physiology*; D004971:Estrus; D005260:Female; D007774:Lactation; D008892:Milk / Q000032:analysis; D010053:Ovary / Q000502:physiology*; D010060:Ovulation; D049590:Postpartum Period; D011247:Pregnancy; D011374:Progesterone / Q000032:analysis; D012621:Seasons; D014599:Uterus / Q000502:physiology
chemical_list: D011374:Progesterone