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Effect of Level and Source of Dietary Protein on Performance and Fecal Flora of Baby Pigs¹

Iowa Agricultural and Home Economics Experiment Station, Ames

Abstract

Fecal samples from 158 pigs were analyzed bacteriologically to study the effects of varying levels or source of protein on population densities of seven common microbiological groups. Changes in counts of lactobacilli, streptococci, total aerobes and total anaerobes, in general, paralleled the rate of gain response to level or source of protein. The counts of coliforms, staphylococci and molds and yeasts were depressed in pigs fed plant proteins, as compared with counts on pigs fed animal proteins. Supplemental methionine added to soybean-protein diets resulted in higher counts of lactobacilli, staphylococci and total aerobes, as compared with the counts on pigs fed the unsupplemented soy-bean protein diet.

¹ Journal Paper No. J-4512 of the Iowa Agricultural and Home Economics Experiment Station, Ames. Project No. 1512.

² Present address: Department of Biochemistry, University of Wisconsin, Madison.

³ Present address: Walnut Grove Products Co., Atlantic, Iowa.