The effect of partially replacing urea nitrogen with protein N on N capture in the rumen of sheep fed a purified diet

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Abstract
1. The influence of replacing 10 % of the urea nitrogen in a purified diet with casein, maize gluten or white fish meal on the efficiency of conversion of dietary-N into microbial N was examined using sheep equipped with rumen fistulas and duodenal re-entrant cannulas.2. Total nitrogen (TN), non-ammonia nitrogen (NAN) and amino acid nitrogen (AAN) flowing to the proximal duodenum were significantly higher (P< 0.05) when maize gluten was added to the diet, and this appeared to be due to an increased efficiency of microbial protein production.3. Pepsin secretion was not significantly different between treatments and the daily amount of pepsin N flowing to the proximal duodenum was very small (40–53 mg). The peak of pepsin activity in duodenal digesta was reached 6–8 h after feeding.4. The possible practical implications of the results are discussed.