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Influence of Sulfur on In Vitro Starch Digestion by Rumen Microorganisms¹

University of Kentucky, Lexington 40506

Abstract

A series of experiments was conducted to study the influence of different sources and levels of supplemental sulfur on in vitro starch digestion by washed rumen microorganisms. Results of studies conducted at a sulfur level (10 µg/ml) previously reported to be near the lower limit of the requirement for cellulose digestion suggested little difference in availabilities of inorganic sources but a lower availability for methionine. In subsequent studies, the sulfur requirement for starch digestion appeared to be substantially lower than reported requirements for cellulose digestion. In simplified medium the added sulfur requirement appeared to be 2 to 2.5 µg/ml from Na₂S₂O₃, 1 to 2 µg/ml from Na₂SO₄ and 1.5 to 1.75 µg/ml from methionine. In complex medium the added sulfur requirement from Na₂SO₄ appeared to be 3 to 5 µg/ml, suggesting mineral interrelationships which increase the requirements. Levels of sulfur as high as 11,000 µg/ml failed to cause significant toxicity in either medium.

¹ The investigation reported in this paper (No. 70-5-62) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² Present address: Department of Animal Sciences, Pennsylvania State University, University Park.