Evaluation of differences between the supplementation or infusion of urea in rumen and/or abomasum on forage digestion, N metabolism, urea kinetics and ruminal urea transporters in cattle fed a low-quality tropical forage.

This study reveals how the site of delivery in the gastrointestinal tract has implications on nitrogen utilization

In ruminants, optimizing N and protein efficiency is about minimizing losses of N in the rumen, and there are several roads to do so.

In cattle systems, many farmers utilize feeding models to estimate protein requirements. However, most models recognize the importance of urea nitrogen (N) recycling in the rumen, but not all account for it.

Reviewing the quantification and regulation of non-protein Nitrogen flux between the gastrointestinal tract and body of ruminants.