Constraints on productivity in the pig herd.
D000818:Animals; D000831:Animals, Newborn; D005260:Female; D008297:Male; D011247:Pregnancy; D011996:Records; D012098:Reproduction; D013552:Swine / Q000254:growth & development* / Q000502:physiology; D013553:Swine Diseases / Q000453:epidemiology; D006113:United Kingdom; D014730:Veterinary Medicine; D014886:Weaning