J. Anim Sci.
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J. Anim Sci. 1969. 29:967-971.
© 1969 American Society of Animal Science
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Metabolizable Energy of Finishing Beef Cattle Rations with and without Stilbestrol1

S. A. Adeyanju, M. A. Fowler2 and Wise Burroughs

Iowa State University of Science and Technology3, Ames, Iowa

Abstract

Six yearling steers were each fed three finishing rations with and without stilbestrol at the maintenance level for short periods of approximately 15 days. The animals were confined continuously in metabolism crates for 105 days and housed in a room maintained at about 28° C. Feed consumed and urine and feces excreted in the last 10 days of each 15-day period were analyzed for dry matter, energy and protein. Metabolizable energy per kilogram of ration was determined, as well as the metabolizable energy for the principal ration ingredients of corn grain and whole plant corn silage. Stilbestrol exerted a favorable influence upon protein utilization in each of the three rations but did not exert an appreciable influence upon ration energy available for metabolism. The metabolizable energy of the corn grain, in megacalories per kilogram of dry matter, averaged 3.28. The comparable value for whole plant corn silage dry matter averaged 2.73.

Footnotes

1 Journal Paper No. J-6152 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 869.

2 Present address: Extension Livestock Production Specialist, 418 Federal Building, Fort Dodge, Iowa 50501.

3 Department of Animal Science.






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Copyright © 1969 by the American Society of Animal Science.