SHORT COMMUNICATION
Effect of polyurethane coated urea on ruminal
ammonia release and fermentation characteristics
in vitro of steam-flaked maize-based diet
1
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology,
China Agricultural University,
Beijing 100094, P.R. China
Publication date: 2007-09-17
Corresponding author
Q. X. Meng
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
J. Anim. Feed Sci. 2007;16(Suppl. 2):207-211
KEYWORDS
ABSTRACT
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 first 8 h of fermentation and were significantly 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.
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