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Influence of Limited Dietary Calcium upon Zinc Absorption, Placental Transfer and Utilization by Swine^1,2,

Louisiana Agricultural Experiment Station, Baton Rouge, Louisiana

Effect of limited dietary calcium upon zinc absorption and subsequent utilization was studied in 24 gravid gilts and third trimester fetuses. Sows given low calcium excreted less zinc and a lower percentage of endogenous zinc than control gilts. Rate of oral and intravenous ⁶⁵Zn fecal loss was slower and the quantity was less for sows fed limited calcium diets. The highest tissue zinc concentration was in maternal liver, and somewhat more zinc was in tissues of sows given low calcium. Fetal tissue zinc levels, except for liver, were less than those for dams, and averaged higher for fetuses from sows fed normal calcium rations. Absorbed ⁶⁵Zn appeared to be more accessible for fetal transfer, and utilization was greater when calcium was limited. However, neither rate of transfer nor movement to and from total organs was significantly affected by dietary calcium intake. Maternal tissue ⁶⁵Zn decreased, whereas that in fetal livers increased progressively 30 times during 7 days, and ultimately contained nearly 50% of the total fetal ⁶⁵Zn. Calculated balance tissue data showed that 90% absorbed ⁶⁵Zn was retained by sows receiving normal calcium rations, and 6.1 ± 1.8% of this was transferred to the total products of conception and subsequently deposited in the placenta (46.7%), fluids (0.4%) and the developing fetus (52.9%) after 168 hours.

² Supported in part by the National Science Foundation (contract GB-6602).

³ Dr. H. Itoh, International Mineral and Chemical Corporation, Skokie, Illinois, Postdoctorate Research Fellow 1964–65, on leave from Faculty of Agriculture, Tohoku University, Sendai, Japan.

Manuscript received 17 November 1967.