9Abdoun K, Stumpff F, Rabbani I, et al. Modulation of urea trans- port across sheep rumen epithelium in vitro by SCFA and CO2 [J]. American Journal of Physiology-gastrointestinal and Liver Physiology, 2010, 29S( Z) : G 190-G202.
10Calsamiglia S, Cardozo P W, Ferret A, et al. Changes in rumen microbial fermentation are due to a combined effect of type of diet and pH[J]. Journal of Animal Science,2008,86(3): 702-711.
