Abstract
Summary Three methods of preservation and storage of hay were compared with respect to their effect upon vitamin synthesis in the digestive tract of cows fed the hays. Fecal and urinary excretions of the vitamins were measured. Whether the roughage was field-cured, mow-cured or ensiled had no significant effect upon the excretion of nicotinic acid, pantothenic acid or riboflavin. Silage apparently favorably affected the synthesis of thiamine in the digestive tract. As a feed for dairy cattle, wood molasses was found to be comparable to cane molasses with respect to its effect upon rumen or intestinal synthesis of nicotinic acid, thiamine and pantothenic acid. In the case of pantothenic acid, this synthetic activity was considerably increased when molasses was present.
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