J. Anim Sci.
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J. Anim Sci. 1955. 14:1095-1102.
© 1955 American Society of Animal Science
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The Influence of Chlortetracycline on the Growth and Carcass Characteristics of Swine Fed Restricted Rations1

H. D. Wallace, J. I. McKigney, A. M. Pearson2 and T. J. Cunha

University of Florida

Abstract

Three experiments, one in drylot and two on pasture, have been conducted to determine the influence of chlortetracycline (Aureomycin) on the growth, feed utilization and carcass quality of growing-fattening swine fed limited rations. A total of 110 pigs were used in the trials.

The results indicate that antibiotic was not beneficial to healthy pigs fed restricted rations under drylot conditions when feed intake of the antibiotic-fed animals was limited to that of the controls. Under these conditions it was shown that chlortetracycline, per se, had very little or no effect on dressing percentage or on backfat thickness. However, when concentrates were fed on pasture the antibiotic appeared to have induced a greater forage consumption and thus produced gains somewhat more efficiently, although the rate of gain was not significantly improved.

Aureomycin had no effect on the carcass measurements of the pigs under any of the feeding regimes. Feed restriction in drylot produced carcasses that were higher in dressing percentage but not greatly different from full-fed animals, in percentage of lean cuts, in backfat thickness and carcass length. On pasture the restriction of feed produced carcasses which were much higher in percentage of lean cuts, much lower in backfat thickness and somewhat lower in carcass yield.

Footnotes

1 Florida Agr. Exp. Sta. Journal Series, No. 392, Gainesville.

2 Present address, Department of Animal Husbandry, Michigan State College, East Lansing, Michigan.






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Copyright © 1955 by the American Society of Animal Science.