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Journal of Dairy Science Vol. 47 No. 2 160-164
© 1964 by American Dairy Science Association ®
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Digestion in the Steer, Goat, and Artificial Rumen as Measures of Forage Nutritive Value1

B. R. Baumgardt, W. J. Byer2, H. F. Jumah3 and C. R. Krueger

Department of Dairy Science, University of Wisconsin, Madison

ABSTRACT

The digestive abilities of steers and goats were compared using first-growth alfalfa-bromegrass forage harvested as hay on four dates in 1960 (Trial 1) and three dates in 1961 (Trial 2). Total collection digestion trials were used and each hay was fed to four goats and to four steers.

In Trial 1, there were no significant differences between steers and goats in the digestibility of dry matter (DDM), cellulose, or energy. Goats digested the crude protein of two of the hays more extensively, however.

Unusually high steer digestion coefficients for one hay in Trial 2 resulted in a significant difference between steers and goats in the digestibility of the dry matter, cellulose, and energy of this hay. Goats digested more of the protein in the late-cut hay than did the steers. Steer and goat digestibilities agreed closely on all other hays and it was concluded that the goat could be used to evaluate the digestible nutrient or energy content of forages.

While each crop was being cut for hay, hand-clipped quadrat samples were also taken and oven-dried. The DDM of these quadrat samples and of conventional hay samples was estimated by an artificial rumen technique (EDDM) and compared to the average steer-goat DDM. Artificial rumen EDDM of the hays did not differ significantly from the animal DDM values. Quadrat samples were significantly higher in EDDM than were the hays.

FOOTNOTES

1 Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

2 Present address: Allied Mills, Inc., Libertyville, Illinois.

3 Present address: Department of Animal Sciences, University of Maine, Orono.






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Copyright © 1964 by the American Dairy Science Association ®.