4Liu J X, Susenbeth A, Si3dekum K H. In vitro gas production measurements to evaluate interactions between untreated and chemically treated rice straws, grass hay, and mulberry leaves [J]. J Anim Sci,2002,80:517-524.
5Sun P F,Wu Y M,Liu J X. In vitro gas production technique to evaluate associative effects among alfalfa hay, rice straw and corn silage[J]. J Anita Feed Sci,2007,16(Suppl. 2):272-277.
