J. Anim Sci.
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J. Anim Sci. 1980. 50:153-159.
© 1980 American Society of Animal Science
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Delignification of Fibrous Wastes by Peroxyacetic Acid Treatments1,2,

L. D. Kamstra3, D. Ronning4, H. G. Walker5, G. O. Kohler5 and O. Wayman3

South Dakota State University, Brookings 57007, Western Regional Research Center, US Department of Agriculture, Science and Education Administration, Berkeley, CA 94710 and University of Hawaii, Honolulu, 96822

Abstract

Ponderosa pine wood chips and bark, straws (wheat, rice and barley), sugar cane bagasse and pineapple leaves were subjected to various peroxyacetic acid delignification treatments to improve digestibility. Digestibility was estimated by in vitro methods using either fresh rumen fluid or isolated cellulase preparations. Digestibility increases were proportional to the concentration of peroxyacetic acid used. In comparison treatments involving equal amounts of peroxyacetic acid, the chemical lost effectiveness with dilution. Although almost complete delignification can be achieved by treatment, it appears that 60% delignification would be most practical for preparation of ruminant feeds. Effective delignification requires 40 to 70 g of peroxyacetic acid per gram of substrate. At present, treatment costs could prohibit practical usage. Rice straws are the least responsive to peroxyacetic acid treatment since fiber encrustation results largely from silica rather than lignin. Safety precautions for synthesis and use of this chemical are suggested.

Footnotes

1 Approved for publication by the Director, Agr. Exp. Sta., South Dakota State Univ., Brookings 57007, as Journal Series No. 1623.

2 Acknowledgement is given to the Forestry Department, Colorado State University, Fort Collins and Don Ellis, Brunswick Timber Corp., Grass Valley, CA 95945.

3 Dept. of Animal Science.

4 Present address: Ralston Purina Co., St. Louis, MO 63188.

5 Feedstuffs Research Unit, WRRC.






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