TY - JOUR AU - Keegan, TP AU - Dritz, SS AU - Nelssen, JL TI - Effects of in-feed antimicrobial alternatives and antimicrobials on nursery pig performance and weight variation T2 - Journal of Swine Health and Production JF - Journal of Swine Health and Production J2 - JSHAP SN - 1537-209X DP - American Association of Swine Veterinarians PB - American Association of Swine Veterinarians DA - 2005/Jan// PY - 2005 VL - 13 M1 - 1 IS - 1 M2 - 12 SP - 12-18 L2 - https://www.aasv.org/shap/issues/v13n1/v13n1p12.html UR - https://www.aasv.org/shap/abstracts/abstract.php?v13n1p12 L1 - https://www.aasv.org/shap/issues/v13n1/v13n1p12.pdf KW - swine KW - nursery KW - antibiotic KW - antimicrobial KW - growth N2 - Objectives: To compare the effects of several antimicrobial alternatives and in-feed antimicrobials on nursery pig performance. Methods: In Experiment One, 720 nursery pigs were used to evaluate feeding three yeast products (LactoSacc, Alltech, Nicholasville, Kentucky; Biomate Yeast Plus, Chr Hansen BioSystems, Milwaukee, Wisconsin; BioSaf, Saf Agri, Minneapolis, Minnesota); three antimicrobial products containing bacteria (Probios and Bio-Plus 2B, Chr Hansen BioSystems) or oligosaccharides (Bio-Mos, Alltech); and the antimicrobial carbadox (Phibro Animal Health, Fairfield, New Jersey). In Experiment Two, 320 nursery pigs were used to evaluate feeding LactoSacc, Bio-Plus 2B, Bio-Mos, and carbadox in an on-farm trial. In Experiment Three, 320 nursery pigs (same commercial herd as in Experiment Two) were used to evaluate feeding carbadox, a combination of tiamulin (Boehringer Ingelheim Vetmedica, St Joseph, Missouri) and chlortetracycline (Alpharma, Fort Lee, New Jersey), a combination of neomycin and oxytetracycline (Phibro Animal Health), and Bio-Mos.Results: In Experiment One, in pigs fed the carbadox diet, ADG was greater (P < .05) than in pigs fed all other diets, and feed:gain was better (P < .05) than in pigs fed the control diet or the Probios diet.In Experiment Two, performance did not differ among treatment groups and controls. In Experiment Three, pigs fed the tiamulin-chlortetracycline and neomycin-oxytetracycline diets had greater ADG and average daily feed intake compared with control pigs (P < .05). There were no differences in growth performance among control pigs and those fed the carbadox or Bio-Mos diets.Implication: The antimicrobial alternatives evaluated did not enhance growth performance. ER -