JOUNARY A R,NEWBOLD J.Methane product by ruminants:its contribution to global warming[J].Journal of Dairy Science,2000,49:231-253.
[2]
LANA R P,RUSSELL J B,VAN AMBURGH M E.The role of pH in regulating ruminal methane and ammonia production[J].Journal of Animal Science,1998,76:2190-2196.
[3]
MCGINN S M,BEAUCHEMIN K A,FLESCH T K,et al.Performance of a dispersion model to estimate methane loss from cattle in pens[J].Journal of Environmental Quality,2009,38:1796-1802.
JOHNSON K A,HUYLER M T,WEST BERG H H,et al.Measurement of methane emission from ruminant livestock using SF6 tracer technique[J].Environmental Science Technology,1994,28:359-362.
[6]
YAN T,MAYNE S,PORTER M G.Effect of dietary and animal factors on methane production in dairy cows offered grass silage based diets[J].International Congress Series,2006,1293:123-126.
HRISTOV A N,IVAN M,RODE L M,et al.Fermentation characteristics and ruminal ciliate protozoal populations in cattle fed medium- or high-concentrate barley-based diets[J].Journal of Animal Science,2001,79:515-524.
[9]
BEAUCHEMIN K A,MCGINN S M.Methane emissions from feedlot cattle fed barley or corn diets[J].Journal of Animal Science,2005,83:653-661.
[10]
CHRISTOPHERSEN C T,WRIGHT A D G,VERCOE P E.In vitro methane emission and acetate:peopionate ratios are decreased when artificial stimulation of the rumen wall is combined with increasing grain diets in sheep[J].Journal of Animal Science,2008,86:384-389.
[11]
ERFLE J D,BOILA R J,TEATHER R M,et al.Effect of pH on fermentation and protein degradation by rumen microorganism in vitro[J].Journal of Dairy Science,1982,65:1457-1464.
[12]
JOHNSON K A,JOHNSON D E.Methane emissions from cattle[J].Journal of Animal Science,1995,73:2483-2492.
[13]
KEBREAB E,CLARKE K,WAGNER-RIDDLE C,et al.Methane and nitrous oxide emissions from Canadian animal agriculture:a review[J].Canadian Journal of Animal Science,2006,86:135-158.
[14]
GRAINGER C,CLARKE T,MCGINN S M,et al.Methane emissions from dairy cows measured using the sulfur hexafluroride (SF6) tracer and chamber techniques[J].Journal of Dairy Science,2007,90:2755-2766.
[15]
PINARES-PATINO C S,MACHMULLER A,MOLANO G,et al.The SF6 tracer technique for measurements of methane emission from cattle- effects of tracer permeation rate[J].Canadian Journal of Animal Science,2008,88:309-320.
