Abstract
Ruminal microorganisms were labelled using [35S]sulphate during growth on a sulphur-deficient medium_ More than 99% of the 35S incorporated by the cells was in the organic sulphur fraction_ The labelled microorganisms were then infused into the abomasum of six sheep which were each fed 775 g of a ration containing 2 -1 % nitrogen and 0 -17% sulphur_

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