Sulfur Amino Acid Requirement of the Lactating Sow

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Abstract
There is no experimental documentation of the sulfur amino acid requirement for the lactating sow. Holden et al. (1968) observed no significant difference in reproductive performance of sows fed diets containing 8.0 to 20.0% crude protein with similar amino acid ratios, except reduced average pig gain during the 2-week nursing period. The linear increase of plasma essential amino acid levels with increasing protein levels suggested their adequacy, except for methionine. The quadratic increase in plasma free methionine suggested it to be the first limiting amino acid during both gestation and lactation (Lucas et al., 1969). With the possible exception of sulfur amino acids, valine and threonine, the 8.0% protein diet appeared adequate in other essential amino acids when compared with the estimated requirements of the gravid gilt (Rippel et al., 1965a, b). The present study was designed to estimate the total sulfur amino acid requirement of sows during lactation by nitrogen balance, plasma free amino acid levels and nursing pig body weight gain. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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