HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Calhoun, M. C. Articles by Shelton, M. Search for Related Content PubMed Articles by Calhoun, M. C. Articles by Shelton, M.

Effect of Chlortetracycline and Sulfamethazine Supplementation on the Performance of Lambs Fed a High Concentrate Diet^{1, 2,}

Texas Agricultural Experiment Station,³ San Angela 76901

Abstract

Supplementation with chlortetracycline and sulfamethazine either alone (55 mg/kg) or in combination significantly increased live weight gain and feed consumption of lambs fed a high concentrate diet in drylot for a 56 day period. Chlortetracycline increased daily gain 0.026 kg and feed consumption 0.08 kg/day. Similar statistics for sulfamethazine were 0.030 and 0.06 kg/day. Feeding the combination produced an additive response, increasing daily gain 0.055 and feed consumption 0.13 kg/day. The effects on feed efficiency were less consistent; however, the average effect of feeding the combination was to increase live weight gain 0.032 kg per kilogram of diet consumed. Although the combination of chlortetracycline and sulfamethazine resulted in a positive live weight gain response throughout the 56-day trial, the major response was obtained initially in the feeding period. Supplementation with chlortetracycline and/or sulfamethazine appeared to be without effect on reducing the stress associated with adaptation to a high concentrate diet, as evidenced by the marked decrease in feed consumption accompanying increases in the concentrate level of the diet.

¹ Technical Article 10348, Texas Agricultural Experiment Station. Project 1534.

² This research was supported in part by a grant from the American Cyanamid Company, Agricultural Division, Princeton, New Jersey, through the courtesy of Mr. Paul Zimmer and Dr. J. J. Drain.

³ Texas A&M University Agricultural Research and Extension Center, San Angelo 76901.