Effect of Urea in the Ration of Cattle on Vitamin Synthesis in the Rumen

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Abstract
The rumen synthesis of nicotinic acid, riboflavin and vitamin B12, as affected by additions of varying levels of urea to low and high fiber rations, was studied by measuring total fecal and urinary excretions of these vitamins by cattle maintained on constant daily intakes. On the low fiber ration, the synthesis of nicotinic acid, and of riboflavin, was significantly improved at the highest urea level. In no instance was there evidence of a-significant depressing effect on vitamin synthesis.