J. Anim Sci.
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J. Anim Sci. 1979. 49:1145-1150.
© 1979 American Society of Animal Science
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Thiopeptin and Roughage Level for Feedlot Steers1

D. R. Gill, F. N. Owens, R. W. Fent and R. K. Fulton2

Oklahoma Agriculture Experiment Station,3, Stillwater 74074

Abstract

Thiopeptin, an acidosis-preventive antibiotic, was fed with a high-concentrate rolled corn diet in a factorial experiment with two roughage levels (15 and 5% cottonseed hulls) and two diet adaptation schemes to 111 growing steers. Thiopeptin supplementation at 11 ppm increased rate of gain by 5.3% (P<.10) and feed efficiency by 7.8% (P<.01) over the 129-day trial. Carcass characteristics remained unaffected. The higher roughage level increased feed intake (8.7%), but decreased feed efficiency (6.8%) indicating that the added hulls were poorly utilized. Incidence and severity of liver abscesses tended to be lower with the higher roughage level and the more rapid diet adjustment scheme.

Footnotes

1 Journal Article 3528 of the Agr. Exp. Sta., Oklahoma State Univ., Stillwater 74074.

2 Merck, Sharp and Dohme Research Laboratories, Rt. 2, Box 384, Canyon, TX 79015.

3 Animal Science Dept.






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Copyright © 1979 by the American Society of Animal Science.