title: Plasma progesterone concentrations in cows and steers after Repositol Progesterone treatment.
abstract: Repositol progesterone was injected intramuscularly into 4 steers and 17 postpartum cows at a dose of 2.2 mg/kg body weight. In steers the plasma progesterone concentration rose to 6.8 ng/ml 1 day postinjection and declined to a mean concentration of 2.1 ng/ml on days 3 and 4 postinjection. Postpartum, presumed anestrus, cows reached a lesser progesterone concentration of 2.9 ng/ml 1 day postinjection and then declined to a lower mean of .7 ng/ml on days 3 and 4 postinjection. These data suggest different rates of metabolism and/or excretion of progesterone by cows and steers.
mesh_terms: D000780:Anestrus; D000818:Animals; D002417:Cattle; D004343:Drug Implants; D005260:Female; D007273:Injections, Intramuscular; D008297:Male; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage* / Q000097:blood* / Q000378:metabolism; D012737:Sex Factors; D013997:Time Factors
chemical_list: D004343:Drug Implants; D011374:Progesterone