Copper deficiency in the sheep. This deficiency produces a marked decrease in the rate of woold growth and a depigmentation of black wool. Copper deficient rabbit and a normal litter-mate. One was maintained on a copper deficient synthetic diet while the other was fed a stock diet. Note the achromotrichia and alopecia.
Sulfur is a component of methionine and cystine-two amino acids found in abundance in wool.
Goliter in the newborn lamb. An increase in the size of the thyroid is brought about by an iodine deficiency. This type of thyroid hypertrophy is known as endemic goiter. Cow with a newborn calf showing the enlarged thyroid. Notice the normal appearance of the dam.