J. Anim Sci.
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J. Anim Sci. 1979. 48:941-946.
© 1979 American Society of Animal Science
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Lignin Digestibility by Lambs Fed both Low Quality and High Quality Roughages1

G. C. Fahey, Jr.2, G. A. McLaren3 and J. E. Williams4

West Virginia University, Morgantown 26506

Abstract

Trials were conducted with lambs to evaluate the digestibilities of lignins from various plant sources using the acid detergent lignin (ADL) and acetyl bromide soluble lignin (ABSL) assays. Roughages used in the digestion studies included corn cobs, wheat straw, oat middlings, bagasse, solvent-extracted feces, alfalfa, and perennial ryegrass. ADL digestibilities ranged from –79.8% (when lambs were fed solvent-extracted feces from animals previously fed wheat straw) to +27.6% (when lambs were fed corn cobs as the roughage source). ABSL digestibilities did not agree with those obtained by the ADL method with values ranging from –44.4% (corn cob-fed lambs) to + 17.2% (bagasse-fed lambs). When using the ABSL technique to quantitatively determine both soluble and insoluble lignin (residual lignin left after acetyl bromide treatment of a roughage), those roughages that exhibited high soluble lignin absorbances had smaller amounts of lignin solubilized by acetyl bromide than did those which exhibited lower absorbance values. Positive correlations were established between the percentage of lignin solubilized by acetyl bromide and the ABSL absorbances of both low and high quality roughages.

Footnotes

1 Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper No. 1511.

2 Present Address: Department of Animal Science, University of Illinois. Urbana 61801.

3 Division of Animal and Veterinary Sciences.

4 Present Address: Department of Animal Science, Oklahoma State University. Stillwater 74074.






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Copyright © 1979 by the American Society of Animal Science.