The article discusses various skin diseases in sheep caused by nutritional deficiencies, such as lack of zinc, vitamin A, cobalt, copper, iodine, and sulfur. These deficiencies can lead to dermatitis, a skin condition. Zinc-responsive dermatoses can occur due to diets lacking zinc or having too much calcium, iron, or other substances. True zinc deficiency affects multiple animals, while idiopathic zinc-responsive conditions usually affect a single animal. Animals with true zinc deficiency show systemic signs, but those with idiopathic conditions do not.