J. Anim Sci.
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J. Anim Sci. 1985. 61:537-545.
© 1985 American Society of Animal Science
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Influence of Zeranol Implants on Growth, Carcass and Palatability Traits in Bulls and Late Castrates1

Wayne Vanderwert2, Larry L. Berger2, Floyd K. McKeith2, Roger D. Shanks3 and Peter J. Bechtel2, 4,

University of Illinois, Urbana 61801

Abstract

The effects of 0-, 36- and 72-mg zeranol implants were evaluated in intact and late-castratedmales. A 36-mg implanted steer treatment group, castrated at the beginning of the trial, was thecontrol. All 36-mg treatment cattle were reimplanted with a second 36-mg implant on d 112;72-mg treatment cattle were not reimplanted. Late castration was performed on d 115 of the 210-dtrial. Intact males implanted with zeranol grew more rapidly than nonimplanted males during thefirst 112 d, but there was no advantage to the higher dosage level. From d 112 to slaughter, bullsoutgained late castrates and produced heavier carcass weights. Bulls had larger rib eyes and a lowerlipid content in the 9-10-11th rib section than late castrates. Implanting increased fat thickness inintact males. Early-castrated steers had lower Warner-Bratzler shear values and greater cookinglosses than bulls and late castrates, but there was no significant difference in taste panel evaluations.Implanting had little effect on testicular traits. Data from this trial indicate that delayingcastration to 1 yr of age does not appear to provide economic advantages over earlier castration.

Footnotes

1 This research was supported by the Univ. of Illinois Agr. Exp. Sta. and by a grant from the International Minerals and Chemical Corp., Terre Haute, IN.

2 Dept. of Anim. Sci.

3 Dept. of Dairy Sci.

4 Send correspondence to P. J. Bechtel, 205 Meat Science Lab, 1503 S. Maryland Drive, Univ. of Illinois, Urbana, IL 61801.






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