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The Mysteries of the Rumen¹

Dairy Department, Michigan State University, East Lansing

ABSTRACT

The rumen has long been filled with mystery. About the time the American Dairy Science Association was organized 50 years ago, W. D. Hoard, founder of Hoard's Dairyman, stated that the rumen of a cow was the darkest place on earth. Thanks to the shining light of Science, many of these mysteries are being resolved. As a result of the development of the rumen fistula, increased interest has been manifested in the application of new methods and techniques to study rumen activity. The first picture of a rumen fistula cow to appear in the Journal of Dairy Science is shown in Figure 1. At the present time, the fistula plugs are made in several designs: plastic plugs with screw-on caps that make removal of all the rumen contents easy and rubber plugs designed to collect gases.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1872.