1. Agroscope Liebefeld-Posieux (ALP), 2008. Feeding Recommendations and Nutrient Tables for Ruminants (in German). Online Version. (Ed ALP, Posieux, Switzerland). 〈http://www.agroscope.admin.ch/futtermitteldatenbank/04834/index.html?lang=de〉 (accessed 19.02.12).
2. Official Methods of Analysis;AOAC,1997
3. Simulating the effect of grassland management and grass ensiling on methane emission from lactating cows;Bannink;J. Agric. Sci.,2010
4. Nutritional management for enteric methane abatement: a review;Beauchemin;Aust. J. Exp. Agric.,2008
5. Report of subcommittee on constants and factors;Brouwer,1965