SECRETION OF CALCIUM AND STRONTIUM INTO MILK
The comparative secretion of Ca/sup 45/ and Sr/sup 89/ into the milk of goats and dairy cows under typical farm management was studied. The effects of calcium and stable strontium levels were investigated by using four diets containing 0.25% Ca, 0.50% Ca, 1.6-1.7% Ca, and 0.25% Ca plus 2.82.9% stable strontium. The comparative behavior of calci um and strontium was the same on all diets except for a possible renal effect with the goats. The Sr/sup 89//Ca/ sup 45/ of the milk was consistently about 0.12 that of the dietary intake(OR/sup milk-diet/ = 0.12). The relative contributions to the discriminatoin against strontium were estimated for the important physiological processes, such as absorption from the digestive tract, passage from blood to milk, and renal excretion. On the medium-calcium diet at steady stated the dairy cows secreted into milk about 0.08% of the ingested Sr/sup 89/ per liter; the goats, primarily because of body size, secreted much more, about 1.4% of ingested Sr/sup 89/ per liter of milk. Since the OR/sub diet-milk/ value did not vary iwth changes in dietary calcium levels it would be expected that the long-term feeding of increased dietary levels of non-contaminated calcium would produce proportional decreases in the amounts of ingested radiostrontium appearing in milk; there would seem to be no advantage in the use of stable strontium for this purpose. Practical aspects are discussed. (auth)
- Research Organization:
- New York State Veterinary Coll., Ithaca
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-008505
- OSTI ID:
- 4801220
- Journal Information:
- Health Physics (England), Journal Name: Health Physics (England) Vol. Vol: 7: Nos. 1 and 2; ISSN HLTPA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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