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The Sulfur Requirement of Growing-Fattening Lambs in Terms of Methionine, Sodium Sulfate, and Elemental Sulfur^1,2,

Illinois Agricultural Experiment Station³

Abstract

A comparative study was made of the sulfur requirements of growing-fattening lambs in terms of methionine, sodium sulfate, and elemental sulfur, added to a purified ration containing 4% urea. The gains on five levels of each of the sulfur sources fitted a quadratic curve. On the basis of the fitted curves, the calculated sulfur percentage requirement was for methionine 0.64±0.048, for sodium sulfate 1.2 7±0.44, and for elemental sulfur 0.47±0.028, respectively.

On the basis of total sulfur about 70% less sulfur was needed as methionine in the diet than as elemental sulfur, or about 50% less as sulfate sulfur. The data suggest that sodium sulfate may be used more efficiently than elemental sulfur.

Satisfactory agreement was found between the sulfur requirements of growing-fattening lambs as reported in studies of two different years.

¹ This is seventh paper in a series on a sulfur in sheep nutrition.

² Grateful acknowledgement is extended to the E.I. duPont deNemours Company, Inc., Wilmington, Delaware, for kindly providing the urea; to Merck and Company, Rahway, New Jersey, courtesy of Dr. H.H. Draper, for generously supplying thiamine hydrochloride and riboflavin: to Vio Bin Corporation, Monticello, Illinois, courtesy of Steve Varner, for generously supplying the wheat germ oil; to Dow Chemical Company, Midland, Michigan, courtesy of Dr. R.W. Colby, for kindly furnishing methionine; and to Calcium Carbonate Company, Quincy, Illinois, courtesy of W. A. Hensley, for generously suplying the chemical mixture used in this study.

³ Animal Science Department, Urbana.