4[2]Gughel Dust,Valetina Gamba Liquid chromatography with ultraviolet of Lasalocad,monensin.salinomycin and narasin poultry feeds using precoluma defivmion[J].Journal of Chromatography Analysia,1999,835:243-246.
5MOSS A R, JOUANY J P, NEWBOLD J. Methaneproduction by ruminants: its contribution to global warming[J]. Annales De Zootechnie, 2000,49 ( 3 ) : 231-253.
6LASSEY K R. Livestock methane emission:from the individual grazing animal through national inventories to the global methane cycle [ J ]. Agricultural and For- est Meteorology, 2007,142 ( 2/3/4 ) : 120-132.
7DINI Y, GERE J, BRIANO C, et al. Methane emission and milk production of dairy cows grazing pastures rich in legumes or rich in grasses in uruguay[ J] .Ani- mals,2012,2(2) :288-300.
8BAKER S K. Rumen methanogens, and inhibition of methanogenesis [ J ]. Australian Journal of Agricultural Research, 1999,50(8) : 1293-1298.
9BOADI D, BENCHAAR C, CHIQUETTE J, et al.Mit- igation strategies to reduce enteric methane emissions from dairy cows : update review [ J ]. Canadian Journal of Animal Science, 2004,84 ( 3 ) : 319-335.
10WHITFORD M F, TEATHER R M, FORSTER R J. Phylogenetic analysis of methanogens from the bovine rumen [ J ]. BMC Microbiology, 2001,1 : 5.