Factors affecting dystocia in beef heifers.
D000818:Animals; D001724:Birth Weight; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000209:etiology*; D003120:Colorado; D003250:Constriction; D004420:Dystocia / Q000453:epidemiology / Q000209:etiology / Q000662:veterinary*; D005260:Female; D005333:Fetus / Q000033:anatomy & histology; D007746:Labor Presentation; D010387:Pelvimetry / Q000295:instrumentation; D011247:Pregnancy; D014593:Uterine Inertia / Q000150:complications / Q000662:veterinary; D014623:Vaginal Diseases / Q000150:complications / Q000662:veterinary