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Lysine Requirement of the Finishing Pig for Maximum Rate of Gain and Efficiency¹

Illinois Agricutural Experiment Station, Urbana 61801

Abstract

Four trials involving 146 finishing pigs were conducted to determine the lysine requirement for rate of gain and feed efficiency. Graded levels of L-lysine HCl were added to a 13.3% protein corn-sesame meal diet containing 3,501 kcal metabolizable energy per kilogram. Levels of .35, .45, .55, .65 and .75% dietary lysine were studied in trials 1 through 3, while in trial 4 an .85% level was also included. Values for each criterion from the four trials were pooled and the lysine requirement was determined by the method of least squares. Estimated requirement, as a percent of the diet, for maximum daily gain was .48% whereas, for maximum gain/feed it was .62%. In a fifth trial, six finishing pigs were used in two 3 x 3 latin square designs to determine maximum nitrogen retention from diets containing .45, .55 and .65% lysine. As level of lysine increased, nitrogen retention increased, but at a decreasing rate. The rate of decrease was not sufficient for an accurate estimate of the requirement for maximum nitrogen retention.

¹ This research was supported in part by grants from the Moorman Mfg. Co., Quincy, Illinois and CPC International Inc., Argo, Illinois.

² The data are from a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

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