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Journal of Nutrition Vol. 96 No. 2 October 1968, pp. 247-254
Copyright © 1968 by American Society for Nutrition
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Maternal-Fetal Utilization of Sulfate Sulfur by the Gravid Ewe1

Sam L. Hansard2 and A. S. Mohammed3

Louisiana Agricultural Experiment Station, Baton Rouge, Louisiana

Blood-balance and maternal-fetal tissue concentration values, following single tracer doses of 35SO4, were used to evaluate sulfate absorption and utilization in 25 yearling gravid ewes and fetuses at 3 periods of gestation. The 81% dietary sulfur excreted was almost equally divided between feces and urine. Ingested labeled sulfate, however, was rapidly absorbed, and 75% was subsequently excreted via the kidneys during 168 hours. Maternal tissue sulfur concentration was unaffected by pregnancy, but retained 35S was significantly higher (P < 0.10) at trimesters 1 and 2 in 45-kg ewes. Absorbed 35S traversed the placenta freely at the 3 trimesters, and maternal-fetal tissue concentration patterns, after 7 days, were similar. Soft tissue 35S levels in third-trimester ewes peaked after 4 hours, and decreased to 168 hours. Values for most bones and placenta were highest after 24 hours, and levels decreased to 7 days. Calculated partition of 35S in third-trimester ewes and products of conception indicated that after 7 days, 55.7% of that absorbed and retained was deposited in maternal tissues, and 44.3% was transferred to the total fetus (77%), the placenta (16%) and to the placental fluids (7%), respectively.

1 Published with the approval of the Director, Louisiana Agricultural Experiment Station, Baton Rouge, Louisiana. Partial support of this study was furnished by the National Science Foundation (Contract no. GE 6602).

2 Present address: Tennessee Agricultural Experiment Station, Knoxville, Tennessee 37916.

3 Dr. A. S. Mohammed, Postdoctorate Research Fellow 1966–67, sponsored by The Sulphur Institute, Washington, D. C.

Manuscript received 18 December 1967.




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