Effect of nitrogen supplementation andZilpaterol-HCl on urea recycling in steersconsuming corn-based diets

摘要

Cattle have the innate ability to recycle nitrogen absorbed post-ruminally back to therumen as endogenously synthesized urea. Urea returning to the rumen provides anadditional opportunity for ruminal microbes to benefit from nitrogen absorbed postruminally.Urea recycling may provide a significant benefit to cattle when proteinrequirements of ruminal microbes are high or when large amounts of the dietaryprotein escape ruminal degradation.