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Response of Pigs to Graded Levels of Soybean Meal and Added Lysine in Ten Percent Protein Rations¹

North Carolina Agricultural Experiment Station, Raleigh

Abstract

Ten percent protein rations were formulated to supply 12.5, 25, and 50% of the protein from dehulled S.B.M. The remainder of the protein was supplied by corn. These rations were fed with and without 0.4% of added lysine during two consecutive seasons. Six pigs were individually fed each ration during each season.

Increasing the proportion of the protein supplied by S.B.M. resulted in significant increases in feed intake and daily gain. Carcass leanness as measured by area of longissimus dorsi muscle was significantly improved by increasing the percent of protein supplied by S.B.M. and by added lysine.

¹ Contribution from the Animal Science Department, North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as paper no. 1536 of the Journal Series.

² The authors wish to acknowledge the assistance of Merck and Co., Inc., Rahway, New Jersey for supplying the L-lysine mono-hydrochloride; Chas. Pfizer and Co., Inc., Terre Haute, Indiana for supplying the vitamin-antibiotic supplement; and Carolina Packers, Inc., Smith field, North Carolina, for co-operation in slaughtering and obtaining carcass data.