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Effect of Molybdate on Sulfide Production from Methionine and Sulfate by Ruminal Microorganisms of Sheep¹

Department of Biochemistry, North Carolina State University, Raleigh, North Carolina 27607

Purified diets containing sodium sulfate and DL-methionine as sole dietary sources of sulfur were fed to fistulated sheep. The effect of dietary sodium molybdate (50 ppm Mo) on the capacity of the rumen microorganisms to produce sulfide from either sulfate or methionine was assayed in the two sulfur diets. Dietary molybdenum significantly inhibited the production of sulfide from sulfate but enhanced significantly the production of sulfide from methionine. The inhibitory effect of molybdenum on sulfide production in vitro and the number of sulfide-producing bacteria present in the rumen of these sheep are discussed in considering the mechanism of the molybdate effect on sulfide production.

KEY WORDS: • molybdenum • sulfide • methionine • sulfate

¹ Contribution from the Schools of Agriculture and Life Sciences and Physical and Mathematical Sciences. Paper no. 4632 in the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, N.C. 27607. This work was supported in part by grant no. AM-13055 from the National Institutes of Health.

² To whom correspondence should be sent.

³ Dr. Matrone died April 2, 1975.

Manuscript received 20 March 1975.