title: Multiple progesterone injections and the duration of estrus in ovariectomized guinea pigs.
mesh_terms: D000818:Animals; D002369:Castration; D004958:Estradiol / Q000494:pharmacology; D004971:Estrus / Q000187:drug effects*; D005260:Female; D006168:Guinea Pigs; D007279:Injections, Subcutaneous; D009821:Oils; D014677:Pharmaceutical Vehicles; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology*; D011409:Propylene Glycols; D011863:Radioimmunoassay; D012726:Sexual Behavior, Animal / Q000187:drug effects; D013997:Time Factors
chemical_list: D009821:Oils; D014677:Pharmaceutical Vehicles; D011409:Propylene Glycols; D011374:Progesterone; D004958:Estradiol