Effects of different dietary levels of chlortetracycline, sulfamethazine, and penicillin combinations on performance of growing-finishing swine

Hale, O.M.; McCormick, W.C.

Research Report, Agricultural Experiment Stations, University of Georgia 226: 9


Accession: 000360604

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Seventy crossbred weanling pigs weighing about 31 lb were fed individually to measure the response to an antibacterial combination of chlortetracycline, sulfamethazine and penicillin. Groups of 10 pigs were randomly allotted to 7 dietary treatments without or with the antibacterial combination premix at 0.25, 0.50, 1.00, 3.00, 5.00 or 7.00 lb/ton feed. Pigs on diets 1 and 3 from weaning to 75 lb required 10.5% and 12% more feed/unit gain (P<.05) than did pigs on diet 6 or diet 7. During phase 2, weaning to 130 lb in weight, pigs on diet 1 without antibiotics required 8.5% more feed/unit of gain (P<.05) than did pigs on diet 6 or diet 7. Pigs on diets 1 and 2 in the third phase of the study, weaning to 210 lb, required 7.3% and 6.3% more feed/unit of gain (P<.05) than pigs on diet 6, and 8.3% and 7.3% more feed/unit of gain (P<.05) than pigs on diet 7. Rate of weight gain was not improved (P<.05) by addition of the antibiotic combination to the diet of pigs in any phase. Near ideal weather conditions prevailed during the experiment with an average maximum daily temperature of 71.3 deg and an average minimum of 49.0 deg F.