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Influence of Ruminal, Abomasal and Intestinal Fistulation on Digestion in Steers^1,2,

University of Kentucky, Lexington

Abstract

One set of dizygous and three sets of monozygous twin steers weighing approximately 950 lb. each were used in digestion trials. Apparent digestion coefficients for dry matter, energy, crude protein, ether extract, crude fiber and nitrogen free extract were used in the following comparisons: (1) rumen-fistulated steers with their intact twins, (2) steers having fistulas in both the rumen and abomasum with their rumen-fistulated twins, (3) steers having fistulas in both the rumen and small intestine with their twins having fistulas in both the rumen and abomasum, and (4) the pre- and post-fistulation performances of each steer. Fistulation did not significantly affect apparent digestion coefficients.

¹ A portion of the data reported herein is taken from a thesis presented by the senior author to the Graduate School, University of Kentucky, Lexington, in partial fulfillment of the requirements of the degree of M.S. in Agriculture. The investigation reported is in connection wth a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² The authors are indebted to H. H. Sutton and C. E. Eastin for surgical services, to T. B. Orr, H. P. Lee and J. Brooks for making the cannulae, and to E. Wachs and E. Ford for analytical assistance.