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Feed-grade urea (FGU), soyabean meal (SBM) and polyurethane coated urea (PCU) were used to investigate the effect of different nitrogen sources on ruminal ammonia release and other fermentation characteristics in vitro. The results showed NH3-N concentrations of PCU and SBM diets were similar during fi rst 8 h of fermentation and were signifi cantly lower by 8.2-20.6% than that of FGU diet (P<0.01). In vitro ruminal pH, 24-h gas production, total VFA and individual VFA molar proportions were not affected by nitrogen sources, except for 24-h ruminal dry matter digestibility in vitro that was higher (P<0.05) for SBM diet than FGU and PCU diets. It was concluded that PCU supplement could slower ruminal ammonia release, which was similar with SBM and better than FGU.

journal of animal and feed sciences

Effect of polyurethane coated urea on ruminal ammonia release and fermentation characteristics &lt;i&gt;in vitro&lt;/i&gt; of steam-flaked maize-based diet