title: Megestrol acetate for postponing estrus in first-heat bitches.
mesh_terms: D000818:Animals; D004285:Dogs / Q000502:physiology*; D004971:Estrus / Q000187:drug effects*; D005260:Female; D008535:Megestrol / Q000494:pharmacology*; D011247:Pregnancy
chemical_list: D008535:Megestrol