Dwarfism in a swine herd: suspected vitamin A toxicosis.

Dwarfism was observed in a group of 30 crossbred pigs. Affected pigs had short limbs and retarded growth. Reduced long-bone length as well as flattening and caudal rotation of the humeral head and the distal femoral condyles were seen at necropsy. Metaphyseal growth plates in vertebrae were narrow and, in long bones, were closed prematurely. There was a sparing of growth plates in traction epiphyses. Vitamin A toxicosis was considered as a possible cause.