Comparative Metabolism of Calcium and Strontium in Lactation
The comparative metabolism of calcium and strontium in the lactating and nonlactating goat was studied, using double tracer methcds. At stendy state, calcium was preferentially secreted into milk by a factor of about 1 1 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, pkasma = 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 tbat strontium is preferentially excreted in the urinary process. (auth)
- Research Organization:
- Oak Ridge Inst. of Nuclear Studies, Tenn.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-016171
- OSTI ID:
- 4308584
- Journal Information:
- Journal of Dairy Science, Journal Name: Journal of Dairy Science Journal Issue: 6 Vol. 41; ISSN 0022-0302
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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