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Lysine Requirement of the Lactating Sow¹

Iowa Agriculture and Home Economics Experiment Station,² Ames 50010

Abstract

TWENTY-FIVE mature Landrace x Yorkshire sows were used in an experiment to evaluate the lysine requirement of the sow during the first 3 weeks of lactation. A basal diet consisting of corn supplemented with vitamins, minerals and essential amino acids was formulated to satisfy the sow's requirement for all essential nutrients except lysine. L-lysine-HCl was added to the basal diet to produce five diets containing: 0.25, 0.35, 0.48, 0.66 and 0.91% lysine, respectively. The sow's lysine requirement was estimated on the basis of nitrogen retention and balance, milk production and composition, pig weight gain, sow weight and backfat loss, and plasma essential amino acids and urea.

Nitrogen retention, pig gain, milk total solids and milk protein increased quadratically (P<.01) with increasing levels of lysine with maxima at 0.48 to 0.66% lysine. Milk production also increased quadratically (P<.05) with a maximum at 0.48% lysine. Nitrogen balance increased linearly (P<.05) with lysine level. Changes in sow weight and backfat thickness were variable, and no significant treatment effects were observed.

¹ Journal Paper No. J-7444 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1786.

² Department of Animal Science.