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

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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.