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4. Discussion
4.1. Impacts of UCM on rumen fermentation
The release rate of the UCM products, which were much less than urea at 2 h of incubation, demonstrates that they may have the potential to be slowly released in the rumen. Similarly, Highstreet et al. (2010) showed that a slowly rumen released encapsulated urea, which was 0.9 urea and 0.1 fat according to the manufacturer, had a measured ruminal in sacco N release of 30, 37 and 41 mg/dL of at 0.5, 4 and 12 h of ruminal incubation respectively, where the 0.5 h value is an estimate of immediately released urea and 4 and 12 h bracket the most likely range of mean retention times of the material in the rumen.