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The Effect of Intermittent Administration of Aureomycin to Growing-Fattening Swine¹

University of Wisconsin³

Abstract

THE growth-stimulating properties of antibiotics are well established for monogastric animals and, in a restricted sense, for ruminants. That periodic feeding or intermittent feeding is beneficial is not very well established. It is a rather common practice among swine producers to purchase antibiotic concentrates in small quantities and use them irregularly in growing-pig rations.

Therefore this experiment was initiated to study the effect of 3- and 10-day intermittent feeding and various combinations of periodic feeding of aureomycin.

Experimental Procedure Eighty-one weanling pigs were stratified according to sex and randomized into nine lots of nine pigs each, four males and five females. The ration consisted of corn, soybean oil meal, dehydrated alfalfa leaf meal, and trace-mineralized salt. The initial crude protein content of the ration was 20 percent; when the average weight of each lot of pigs reached 75 pounds, the protein content was reduced to 17 percent, and again when the average weight of each lot reached 125 pounds, it was reduced to 14 percent. Crystalline aureomycin ⁴ was included in the feed at a rate of 20 milligrams per kilogram of ration. The evaluation of treatments was based on rate and efficiency of gain and gross appearance of the animals. The animals were housed on concrete and cared for in accordance with accepted animal husbandry practices; feed and water were supplied ad libitum.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

² Present address: Georgia Coastal Plain Experiment Station, Department of Animal Disease, Tifton, Georgia.

³ Departments of Animal Husbandry and Biochemistry, Madison, Wisconsin.

⁴ Lederle Laboratories Division of American Cyanamid Company, Pearl River, N. Y.