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Effects of Chlortetracycline, Inedible Animal Fat, Stilbestrol and High and Low Quality Roughage on Performance of Yearling Steers

I. Feed Consumption and Rates of Gain

State College of Washington, Pullman²

Abstract

Forty-eight yearling, grade Hereford steers were allotted to a factorial experiment in which roughages (alfalfa and wheat straw), chlortetracycline, fat and stilbestrol were the variables. Individual feeding these steers for 183 days indicated that:

1. Chlortetracycline significantly increased rates of gain in rations with alfalfa or wheat straw.
   
2. Fat increased rates of gain of steers consuming alfalfa but reduced rates of gain of straw-fed steers.
   
3. Stilbestrol had no significant effect on either rates of gain or on feed required per pound of gain.
   
4. No apparent undesirable side effects were produced as a result of feeding stilbestrol.
   
5. No interaction between chlortetracycline and stilbestrol was found.
   
6. Neither hemoglobin nor hematocrit values were affected by the treatments imposed in this experiment.
   

¹ Conducted in partial fulfillment for the degree, Doctor of Philosophy in Animal Science. Scientific Paper 1446, Washington Agricultural Experiment Stations, Pullman. Project No. 1217.

² Appreciation is expressed to: Centennial Flouring Mills, Spokane, Mr. David Proctor, for mixing a portion of the feed at cost. Mallinckrodt Chemical Works, New York, N. Y., Mr. R. B. Clark, for the stilbestrol used in this test. National Renderers Association, Mr. John Hamel, Jr., President, Chicago, for support of this project. American Cyanamid Co., Research Division, New York, Dr. R. F. Elliott for contributing the chlortetracycline used in this test. Ralston Purina Co., Spokane, Mr. Mark Hengen, Branch Manager, for mixing a portion of the feed and pelleting the rations at cost. Western States Packers Assn., San Francisco, Mr. E. B. Forbes, Pres. Gen. Manager, for support of this project. R. E. Chirstian for aid in statistically analyzing the data.