J. Anim Sci.
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J. Anim Sci. 1966. 25:29-33.
© 1966 American Society of Animal Science
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Effect of Prefinishing Treatment upon Finishing Performance and Carcass Characteristics of Beef Cattle1

A. T. Ralston, W. H. Kennick, T. P. Davidson2 and K. E. Rowe

Oregon Agricultural Experiment Station, Corvallis

Abstract

One-hundred eight and 120 steer calves from nine and ten sources weighing about 227 kg. were fed ten different prefinishing rations for 110 days and then were finished on a common ration for an average of 140 days in 1963 and 1964, respectively. Average prefinishing gains were from 0.01 to 0.85 kg. and from 0.48 to 1.09 kg., but widely different prefinishing gains (0.01 kg. and 0.67 kg.) did not result in significant differences in the rate of finishing gains. The prefinishing treatment, especially type of diet, exerted a greater effect upon finishing gains than did source of animals. Feed efficiencies were not always proportional to prefinishing gains, and prefinishing rations containing corn silage had the greatest overall feed efficiency, regardless of the gains produced. Analysis of covariance using prefinishing rate of gain as the covariate suggests that much of the difference was due to rate of prefinishing gain. The evidence in this study suggests that the type of ration may also have a direct effect on finishing gains. Carcass characteristics (marbling score, grade and trim-cut yield) were more dependent upon source of animals than upon prefinishing treatment.

Footnotes

1 Technical Paper No. 1934, Oregon Agricultural Experiment Station.

2 Department of Animal Science.

3 Department of Statistics.






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