Body posture and litter size.
D000671:Amputation, Surgical; D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight; D005260:Female; D005298:Fertility; D005552:Forelimb / Q000601:surgery; D006112:Gravitation; D008124:Locomotion; D011187:Posture; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D014591:Uterine Diseases / Q000209:etiology; D014596:Uterine Prolapse / Q000209:etiology