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Strontium and Calcium Uptake and Excretion in Lactating Dairy Cows¹

UT-AEC Agricultural Research Laboratory, Oak Ridge, Tennessee, and Department of Dairying, University of Tennessee, Knoxville

ABSTRACT

Sr⁸⁹ and Ca⁴⁵ were given orally to lactating dairy cows. From a single dose, 0.55 ± 0.05 and 1.8 ± 0.30% of the administered Sr⁸⁹ were found in milk and urine, respectively, during a nine-day period. Under the same conditions, 3.77 ± 0.17 and 0.82 ± 0.08% of the administered Ca⁴⁵ were found in milk and urine, respectively. The average observed ratios of Sr⁸⁹/Ca⁴⁵ for four cows were: blood diet = 0.33; urine diet = 1.82; milk diet = 0.15; milk blood = 0.44, urine blood = 5.43. The excretion patterns for Sr⁸⁹ in milk, urine, and feces can be described almost entirely by an exponential function of time.

¹ This manuscript is published with the permission of the Director of the Tennessee Agricultural Experiment Station, Knoxville. This work was completed under Contract No. AT-40-1-GEN-242 between the University of Tennessee College of Agriculture and the Atomic Energy Commission. The radioactive materials used were obtained from the Oak Ridge National Laboratory, on allocation from the United States Atomic Energy Commission.