J. Anim Sci.
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J. Anim Sci. 1975. 40:655-659.
© 1975 American Society of Animal Science
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Effects of Dietary Antimicrobials during Early Growth and on Subsequent Swine Performance1

Richard C. Wahlstrom2 and George W. Libal2

South Dakota State University, Brookings 57006

Abstract

Three experiments were conducted to study the response of weaned pigs to various antimicrobial compounds fed for 35 or 37 days and the effect of withdrawal of these compounds on subsequent performance. Antimicrobials used were carbadox, furazolidone, a combination of furazolidone, oxytetracycline and arsanilic acid (FOA) and a combination of chlortetracycline, sulfamethazine and penicillin (CSP). In trials 2 and 3 the effect of tylosin in the finishing diet was also studied. High level antimicrobial feeding for 35 or 37 days increased average daily gain during this feeding period in all three trials and lowered feed/gain ratios in trials 1 and 3. During the finishing period, pigs fed the control diet following withdrawal of antimicrobials had similar gains and feed/gain ratios as those fed the control diet continuously in trial 1 and in trial 2, except for pigs previously fed CSP that continued to gain at a faster rate. In trial 3, all pigs previously supplemented with antimicrobials gained faster following withdrawal as compared to control pigs. Tylosin significantly (P < .01) lowered feed/gain ratio during the finishing period (trial 2) but did not significantly (P > .05) affect rate of gain in either trial 2 or 3.

Footnotes

1 Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication No. 1293 of the Journal Series.

2 Department of Animal Science.






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Copyright © 1975 by the American Society of Animal Science.