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A Quantitative Study of Vitamins in the Rumen Content of Sheep and Cows Fed Vitamin-low Diets

III. Thiamin

One Figure

Division of Animal Husbandry, College of Agriculture, University of California, Davis

1. Four sheep were fed a ration containing less than 0.4 µg. of thiamin per gram. The dried rumen and reticulum contents of the sheep were found to contain approximately 7 µg. of thiamin per gram.

2. No thiamin was detected in the rumen contents of two fistulated cows fed the same deficient ration, but the milk of one of these cows contained between 2 and 2.5 µg. per gram on a dry basis.

3. Thiamin was detected in the rumen contents of a nonfistulated cow fed the deficient ration.

4. These results confirm and extend the work of earlier investigators in indicating that thiamin is not a dietary essential for ruminants.