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Growth Effects of some Antibiotics on Suckling, Growing, and Fattening Pigs

University of Idaho Agricultural Experiment Station¹

Abstract

Rations of Duroc and Poland China pigs were supplemented with crystalline aureomycin or crystalline terramycin for different growth periods. The supplements were started at 2 days or 4 weeks of age and stopped, at either 4 weeks, 8 weeks, or 200 pounds.

Both antibiotics, when fed from 2 days or from 4 weeks of age to 200 pounds, were equally effective in inducing gains of from 8 to 17 percent more than for the controls in both breeds. The average daily gains for pigs that received antibiotic supplement for only the first 8 weeks were from 0.02 to 0.08 pound less than for those pigs receiving the supplement throughout the suckling, growing-fattening period.

Pigs receiving 2.5 mg. per day of either antibiotic from 2 days to 4 weeks of age gained 16 to 18 percent more up to weaning (8 weeks) than did the controls. However, by market time (200 pounds), the controls had gained about the same as the early supplemented groups. A significant interaction between litters and rations in this experiment suggests the possibility of differential responses to antibiotics supplementation due to effects which are common to littermates.

¹ Published with the approval of the Director of the Idaho Agricultural Experiment Station, Moscow, Idaho, as Research Paper No. 360.