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Soluble Rumen Liquor Lignin Hemicellulose: Composition and Influence on In Vitro Rumen Microbial Protein Synthesis

West Virginia University, Morgantown 26506

Abstract

This work was conducted to determine whether partially digested, cell wall polysaccharides isolated from rumen liquor were capable of stimulating in vitro rumen microbial protein synthesis. Polysaccharide fractions isolated from cell-free rumen liquor obtained from a rumen-fistulated Holstein cow fed either corncobs or sawdust were similar to acid-resistant hemicellulose (ARH) isolated from corncobs. When incorporated into a fermentation medium at the .04% level, dialyzed corncob rumen liquor lignin-hemicellulose fractions (RLLH) were more effective than an undialyzed fraction in improving in vitro protein synthesis. The RLLH fractions isolated from rumen liquor after the first and second weeks of feeding corncobs were more effective in stimulating in vitro microbial protein synthesis than those from the third and fourth weeks. The corncob RLLH fractions from the third and fourth week period contained more (P<.05) total carbohydrate than those from the first and second weeks. The RLLH fraction isolated from rumen liquor from the sawdust-fed cow also improved (P<.01) in vitro microbial protein synthesis.

² Present address: Animal Science Dept., Oaklahoma State Univ., Stillwater.

³ Present address: Dept. of Animal Science, Univ. of Illinois, Urbana.