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Lysine Need of Swine at Two Stages of Development

Illinois Agricultural Experiment Station, Urbana

Abstract

Experiments were conducted to determine the lysine requirement of the baby pig and finishing pig fed diets containing 22.0 and 12.0% crude protein, respectively. The lysine requirement for the baby pig fed a 22% protein diet containing 3344 kcal. of metabolizable energy per kg. of diet was 1.2 to 1.34% of the diet in two experiments. The requirement is about 1.2% of the diet or 5.5% of the dietary protein.

Three trials with the finishing pig using an equal-feeding technique indicated that the lysine requirement was in the range of 0.36 to 0.41% when fed a diet containing 12% protein and 3219 kcal. of metabolizable energy per kg. of diet, or about 33% of the dietary protein.

When combinations of soybean meal and sesame meal were used to furnish the graded levels of lysine varying from 0.26 to 0.72% of the diet, the gains failed to plateau.

¹ Present address: Commercial Solvents Corporation, Terre Haute, Indiana.

² The authors wish to acknowledge Chas. Pfizer & Company, Inc., Brooklyn, New York, and Merck and Company, Rahway, New Jersey, for funds and products which made this investigation possible.