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Lysine Supplementation of Corn- and Barley-Base Diets for Growing-Finishing Swine¹

Iowa Agricultural and Home Economics Experiment Station⁵, Ames

Abstract

Four experiments involving 268 growing-finishing swine were conducted to study the value of supplemental lysine in swine diets. Corn-soybean meal diets containing 12 or 10% protein were improved by an addition of 0.05% L-lysine monohydrochloride. Supplementation of the low protein diets with lysine resulted in faster gains, more efficient feed conversion and leaner carcasses. For corn-soybean meal diets higher in protein, the results from an addition of lysine were more variable; however, slight improvements in gain and feed conversion were observed. Although the lysine content in the barley-soybean meal diets were higher than in the corn-soybean meal diets, a greater response was observed to supplemental lysine in the barley diets than in corn diets. This would indicate that the availability of the lysine in barley is less than that of corn or soybean meal.

¹ Journal Paper No. J-4500 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Projects No. 930 and 1513.

² Present address: National Research of Animal Husbandry, Copenhagen, Denmark.

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

⁴ The authors gratefully acknowledge E. I. duPont De Nemours Co., Wilmington, Delaware for grants-in-aid and materials which partially supported this work.

⁵ Department of Animal Science.