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Barley Rations for Swine. III. Lysine and Methionine Supplementation: Effects on Rate and Efficiency of Gain, and on Carcass Characteristics¹

University of Minnesota, St. Paul

Abstract

Ninety growing pigs were used in each of two experiments to obtain further information on the role of supplemental lysine and methionine in pelleted barley-soybean meal rations for swine.

In neither trial did the addition of either or both of the test amino acids to a 14% protein pelleted barley ration, based on a 13.3% protein barley and soybean meal (44%), result in improved rate and efficiency of gain, nor was a trend apparent. Carcass leanness as measured by backfat thickness, cross-sectional area of the longissimus dorsi muscle, and percentages of trimmed ham and loin of slaughter weight, or of chilled carcass, was not significantly increased due to the amino acid additions.

¹ Paper No. 5216, Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Animal Husbandman, Northwest Experiment Station, University of Minnesota, Crookston.

³ Superintendent, Northeast Experiment Station, University of Minnesota, Duluth.

⁴ Acknowledgement is due Merck, Sharp and Dohme Research Laboratories, Railway, N. J.; Standard Brands, Inc., New York. N. Y.; and, Chas. Pfizer & Co., Terre Haute, Ind., for generous supplies of experimental materials and ration components; Elliott Packing Co., Duluth, Minn., and Swift & Co., South St. Paul, Minn., for excellent cooperation and assistance in collection of carcass data; James Nordstrom and John Goihl for summarizing and analyzing the data.