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Evaluating Wood Pulp as Feedstuff for Ruminants and Substrate for Aspergillus Fumigatus¹

Forest Products Laboratory, Forest Service, U.S. Department of Agriculture, Madison, Wisconsin 53705 and Solid Waste Research Laboratory, Environmental Protection Agency, Cincinnati, Ohio 45213

Abstract

TEN chemical pulps and two mechanical pulps were analyzed for Klason lignin, total carbohydrate, ash, in vitro rumen dry matter digestibility and single-cell protein growth by Aspergillus fumigatus. The pulp fines from each pulp that passed through a 100-mesh wet screening were also analyzed.

In vitro digestibility ranged from 67% to 98% for the chemical pulps and pulp fines and from 0% to 7% for the mechanical pulps and pulp fines.

Aspergillus fumigatus produced fungal growth with 14.5% to 30% crude protein in 4 days at 35 C when grown on chemical wood pulps from hardwood species with lignin content ranging from 25% to less than 0.1%. The fungus grew only on softwood pulps that had low-lignin content; it did not grow on the mechanical pulps.

¹ Trade and company names are included for the benefit of the reader and do not imply any endorsement or preferential treatment of the product by the U.S.D.A.

² Chemical Engineer, Forest Products Laboratory, Forest Service, U.S.D.A.

³ The authors gratefully acknowledge Marilyn Effland, Jeanne Wipperman, and Lester Zank for the chemical analysis; Harold L. Sparks for the Kjedahl nitrogen analysis; and W. Emile Coleman and Donna Ferris for the amino acid analysis.

⁴ Research Microbiologist, Solid Waste Research Laboratory, National Environmental Research Center, U. S. Environmental Protection Agency, Cincinnati, Ohio.