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Comparative Utilization of Dietary Calcium and Strontium-90 by Pigs and Sheep

Cornell University, Ithaca, New York , U. S. Department of Agriculture^,2 and and U. S. Atomic Energy Commission^,3

Abstract

The comparative utilization of dietary calcium and of Sr⁹⁰ was determined in pigs and sheep under typical management conditions by balance feeding trials, radioassay for Sr⁹⁰ present in feedstuffs in 1958, and chemical analysis for calcium.

A ration consisting of hay from crop year 1958, soybean meal and corn ranged from 74 to 93 µµc Sr⁹⁰/gm. Ca. The hay contributed about 90% of the Sr⁹⁰ intake of the animals.

The pigs started with a body burden of 3.7 µµc Sr⁹⁰/gm. Ca and finished with 9.4; comparative values for the sheep were 30 and 27. For the pigs the comparative utilization of calcium and Sr⁹⁰ was 48 and 8.6% respectively; values for the sheep were 30 and 6.3%.

In agreement with values for other species, the pigs and sheep utilized Sr⁹⁰ about 0.2 as effectively as calcium.

¹ The authors acknowledge the help of G. H. Wellington and J. R. Stouffer in regard to slaughter of animals, E. J. Thacker and K. E. Beeson for assistance in handling of whole animal carcasses, R. Dever for ashing of the samples, and G. Hamada who performed the analyses.

² Soil Conservation Service, Plant Industry Station, Beltsville, Maryland.

³ Analytical Division, Health and Safety Lab., N. Y. Operations Office.