Description: Sulfur deficient lamb and control. Sulfur is a component of many important compounds in metabolism. It occurs in certain hormones, estrogens and insulin, in the vitamins thiamin and biotin, in complex carbohydrates, lipids, enzymes, and the sulfur containing amino acids, methionine and cystine, which are found in abundance in wool. In ruminants consuming large amounts of non-protein nitrogen (NPN) it is necessary to maintain a N:S ratio in the range of 12:1 to 14:1 to provide adequate sulfur for microbial protein synthesis. In the left image above, inadequate amounts of sulfur were fed to a growing lamb which resulted in reduced growth and impaired wool production.