EFFECT OF VITAMIN DEFICIENCIES IN NEW HAMPSHIRE CHICKS INJECTED WITH HIGH DOSES OF THYROXINE12

Abstract
In New Hampshire chicks fed a ration low in thiamin, pyridoxine, biotin, pantothenic acid, and riboflavin, injected thyroxine produces blackening at the base of the wing feathers. In vit. D and E deficiency, thyroxine produced deeper blackening than was observed in D and E deficiency without thyroxine. Thyroxine caused high mortality in chicks fed a ration low in folic acid and pantothenic acid. Pantothenic acid deficiency symptoms in chicks were partially counteracted by thyroxine injn.