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Journal of Dairy Science Vol. 76 No. 3 812-818
© 1993 by American Dairy Science Association ®
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Effect of Aspergillus oryzae Fermentation Extract (Amaferm®) on In Vitro Fiber Degradation

A. A. Beharka 1 and T. G. Nagaraja 1

1 Department of Animal Science and Industry, Kansas State University, Manhattan 66506-1600

The influence of Aspergillus oryzae fermentation extract (Amaferm®) on in vitro fiber degradation was determined by incubating eight ground fibrous feedstuffs with rumen fluid and buffer inoculum. Amaferm® was added at 0, .4, .8, or 1.2 g/L of fermentation mixture. Both NDF and ADF degradabilities were determined after 96 h of incubation. Addition of extract had no effect on NDF or ADF degradability of pure cellulose, low endophyte fescue, wheat straw, corn silage, or prairie hay. Addition of Amaferm® at .8 or 1.2 g/L increased NDF and ADF degradations of bromegrass hay and alfalfa hay; its addition at .4 or .8 g/L, but not at 1.2 g/L increased NDF and ADF degradation of high endophyte fescue hay. In a second set of in vitro fermentations, selective antimicrobials (penicillin, streptomycin, and cycloheximide) were used to assess the influence of Amaferm® on various microbial groups. The enhanced fiber degradation by Amaferm® was attributed to its stimulation of bacterial activity because its addition to whole rumen fluid without or with cycloheximide increased fiber digestion. In contrast, addition of Amaferm® to the whole rumen fluid plus penicillin and streptomycin treatment had no effect on fiber degradation, suggesting that fungal or protozoal activity was not affected by treatment. In conclusion, Amaferm® increased fiber digestibility of certain feedstuffs, and the increase was mediated via stimulation of rumen bacterial, but not fungal or protozoal activities.

Key Words: Aspergillus oryzae fermentation extract • fiber degradation • rumen fermentation

Submitted on April 10, 1992
Accepted on October 13, 1992




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J. E. Nocek and W. P. Kautz
Direct-Fed Microbial Supplementation on Ruminal Digestion, Health, and Performance of Pre- and Postpartum Dairy Cattle
J Dairy Sci, January 1, 2006; 89(1): 260 - 266.
[Abstract] [Full Text] [PDF]


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Copyright © 1993 by the American Dairy Science Association ®.