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Journal of Dairy Science Vol. 40 No. 4 369-376
© 1957 by American Dairy Science Association ®
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Effects of Combinations of Feedstuffs, with and without Aureomycin, on In Vitro Digestion of Cellulose by Rumen Microorganisms1

F. J. Hanold2, E. E. Bartley and F. W. Atkeson

Department of Dairy Husbandry, Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

Effects of various nutrients and feedstuffs on the in vitro digestion of cellulose by rumen microorganisms have been investigated (1–7, 10, 17–19). In most of these studies, only the effects of single feedstuffs on cellulose digestion were tested. Since it was established that the kind of feedstuff affected cellulose digestion, it seemed possible that different complementary effects might result with various combinations of feedstuffs. It seemed probable that such findings might be important in formulating practical rations and in interpreting feeding results that disagree. This research was initiated to study these problems in vitro with feed combinations used in dairy cattle feeding.

One of the investigations on various feedstuff combinations which seemed to be indicated was adding aureomycin in duplicated trials, because it has been shown to depress cellulose digestion in vitro (11, 17, 18). Radisson (17) found that this inhibitory effect of aureomycin was considerably greater when filter paper was the source of cellulose than when alfalfa hay, bromegrass hay, or prairie hay was used.

FOOTNOTES

1 Contribution No. 248, Department of Dairy Husbandry, Kansas Agricultural Experiment Station, Manhattan.

2 Present address: Albers Research Station, Carnation Milk Farms, Carnation, Washington.






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Copyright © 1957 by the American Dairy Science Association ®.