Sulfur Amino Acid Requirement for Lactation in the Rat.

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Abstract
A short-term lactation test has been used to study the effects of cystine supplementation for purified diets containing casein as the sole protein source. Supplementation of 12, 18 and 24% casein diets with 0.5% L-cystine markedly improved lactation performance as judged by weaning weights of young and mother. Cystine supplementation of the 30% casein diet improved weaning weights of the young significantly with less beneficial effects on maternal weight. The data indicate that total sulfur amino acid requirement for optimal lactation in the Long-Evans rat may be placed at slightly more than 1% of the diet and that cystine may furnish at least half of this requirement.