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Comparative Metabolism of Calcium and Strontium in Lactation

Medical Division, Oak Ridge Institute of Nuclear Studies, Oak Ridge, Tennessee^,3

ABSTRACT

The comparative metabolism of calcium and strontium in the lactating and nonlactating goat was studied, using double tracer methods. At steady state, calcium was preferentially secreted into milk by a factor of about 11 over strontium in its passage from diet to milk. With corollary data from nonlactating animals, it was found that the largest amount of discrimination took place in the gastrointestinal absorption of these alkaline earths, calcium being absorbed from three to four times that of strontium. The over-all discrimination of 0.09 between milk and diet resulted primarily from the following discrimination factors: absorption, 0.24; urinary excretion, 0.60; transfer from plasma to milk, 0.61. Under steady state conditions, the relative Sr*/Ca* ratios were diet = 1, plasma = 0.23, skeleton = 0.23, milk = 0.09, and urine = 4.0. These values indicate that there is no differential movement of calcium and strontium between blood and bone, and that strontium is preferentially excreted in the urinary process.

¹ Present address: Laboratory of Radiation Biology, Department of Physiology, New York State Veterinary College, Cornell University, Ithaca, N. Y.

² Present address: Department of Chemistry, University of Tennessee, Memphis, Tenn.

³ Under contract with the United States Atomic Energy Commission.

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