Effect of Low Protein Intake on the Deposition and Placental Transfer of Sulfur-35

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Abstract
A diet containing 10% of protein in the form of casein was adequate for growth and reproduction in female rats over a limited period of time. Despite their low sulfur intake, blood, liver and muscle from these rats were found not to be appreciably lower in sulfur than these same tissues from rats fed a diet containing 20% of protein. The rats fed low protein used a higher percentage of available sulfur, depositing in the tissues significantly larger amounts of intramuscularly administered S35 than rats receiving 20% of protein. The amount of S35 transferred to the fetuses in 48 hours increased with increasing fetal age, and was greater in the rats maintained with the low-protein diet than in those fed 20% protein. Stable sulfur concentrations were lower in low-protein fetuses.