Lysine Requirement for Reproduction in Swine

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Abstract
Twenty-four Yorkshire × Landrace gilts were used in an experiment to determine the lysine requirement for reproduction. L-lysine·HCl was added to a fortified corn diet to attain four lysine levels of .2, .3, .41 and .55% lysine (equal logarithmic spacing). The diets were fed at the rate of 1.82 kg daily before mating and during two reproductive cycles. During each 3-week lactation, all animals were fed the same 13% crude protein corn-soybean meal diet. Littersize and feed intake were standardized during both lactations. Nitrogen balance trials were conducted before mating and during each trimester of pregnancy. As dietary lysine increased, urinary nitrogen decreased and nitrogen retention increased linearly (P<.005). Beyond .41% dietary lysine, the urinary excretion decrease and the nitrogen retention increase were minimal. Similarly, plasma urea nitrogen decreased and plasma lysine increased (linear component was significant at P<.005) as dietary lysine levels increased with inflections in the response curves beyond the .3% lysine level. Copyright © 1976. American Society of Animal Science . Copyright 1976 by American Society of Animal Science.

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