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Protein Levels with and without an Antibiotic for Growing-Finishing Swine Fed on Legume Pasture¹

Iowa Agricultural Experiment Station³

Abstract

Rations of corn and soybean oil meal fortified with minerals and vitamins were fed to pigs individually at different protein levels of 8, 10, 12, 14, 16 and 18% with and without chlortetracycline hydrochloride from approximately 30 lb. up to 200 lb. on alfalfa pasture.

Each of the response criteria including growth, feed intake, and feed efficiency showed a statistically significant quadratic effect for the level of protein fed during the 30 to 75 lb. period and from 30 to 200 lb. period. A maximum was reached in gains and feed efficiency at 16% protein up to 75 lb. and at 14% protein up to 200 lb. There was no effect from the addition of the antibiotic on gains or feed intake but it did affect the efficiency during the overall period, though this effect was small. The differences in the live probe measurements of back fat were not shown to be attributable to ration treatment.

¹ Journal Paper No. J-2983 of the Iowa Agr. Exp. Sta., Ames. Project No. 930.

² Present address: Department of Animal Husbandry, University of Florida, Gainesville.

³ Department of Animal Husbandry.

Grateful acknowledgement is made to Don Quinn and his associates at the Swine Nutrition Research Farm for their assistance.