J. Anim Sci.
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J. Anim Sci. 1971. 33:520-528.
© 1971 American Society of Animal Science
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Urea and Aldrin in All-Concentrate and High Roughage Diets Fed to Diethylstilbestrol-Implanted Heifers1

James Bond2, T. S. Rumsey2 and G. V. Richardson3

U.S. Department of Agriculture, Beltsville, Maryland 20705

Abstract

Oltjen, Rumsey and Putnam (1971) reported satisfactory feedlot performance and carcass characteristics of beef steers finished on all-roughage diets. Short-term feeding of all-concentrate diets to finishing beef cattle for slaughter has also been successful (Wise et al., 1961; Davis, Oltjen and Bond, 1963; Oltjen, Davis and Hiner, 1965; Oltjen et al., 1966; Durham, Ellis and Cude, 1967) but in some cases, cattle appear to go "off feed" when fed for periods longer than 100 days (Oltjen et al., 1966). Early attempts to raise calves from birth to slaughter on diets containing no roughage were not satisfactory (Davenport, 1897; McCaudlish, 1923) but recently Bond and Rumsey (1968) demonstrated that steers can be reared satisfactorily from 14 days of age to slaughter on an all-concentrate diet.

Currently, there is considerable interest in the feeding of urea, the performance of heifers, and the effects of insecticides and hormones on performance of cattle. The purpose of this study was to investigate the effects of an all-concentrate diet, urea, diethylstilbestrol (DES) and l,2,3,4,10,10-hexachloro-l,4,4a, 5,8,8a-hexahydro-l,4-endo-exo-5,8-dimethano-naphthalene (aldrin) on the growth, performance, and physiology of beef heifers.

Footnotes

1 The authors gratefully acknowledge the assistance of B. L. Phillips for the care of the experimental animals.

2 Animals Science Research Division, A.R.S., Beltsville, Maryland 20705.

3 Biometrical Services, A.R.S., Fort Collins, Colorado 80521.






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Copyright © 1971 by the American Society of Animal Science.