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The Influence of Certain Antibiotics on the Palatability of Swine Rations

Florida Agricultural Experiment Station, Gainesville¹

Abstract

Three experiments involving 62 pigs were conducted to determine the influence of chlortetracycline, oxytetracycline, penicillin V and erythromycin on the palatability of swine rations. Results obtained appear to justify the following statements.

Chlortetracycline enhanced the palatability of swine rations and was much preferred, when a choice was given, over oxytetracycline, penicillin V and erythromycin. Oxytetracycline and penicillin V did not clearly improve or depress the acceptability of feeds containing them.

The results pertaining to erythromycin were very conclusive. Pigs completely avoided feed containing this antibiotic when other feed was available.

Since greater feed consumption is one of the sought-after goals in pork production, care must be exercised to prevent the fortification of growing-fattening swine rations with non-palatable materials. Since erythromycin appears to fall into this category it would seem logical to judge it as an unsuitable antibiotic for swine feeding purposes.

¹ Journal Series, No. 629. Department of Animal Husbandry and Nutrition. This study was supported in part by grants from Chas. Pfizer and Co., the American Cyanamid Co., and the Eli Lilly Co.