8Orpin, C.G. The role of ciliate protozoa and fungi in the rumen digestion of plant cell walls. Anim, Feed sci. Tech., 1983, 10:121 ~ 143
9Wilson M J et al. Appl Environ Microbial, 1984;48:473 -481
10Akin D E , Gordon G L R , Hogan J P. Rumen bacterial and fungal degradation of Digitariapentzii grow with or without sulfur[J]. Applied and Environ mental Microbiology. 1983, 46:738 ~ 748