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Calcium Metabolism in Dairy Cows as Studied with Ca⁴⁵

University of Tennessee-Atomic Energy Commission Agricultural Research Program, Oak Ridge, Tennessee

ABSTRACT

Investigations on the mechanism of Ca mobilization and its secretion into milk are receiving new impetus from the availability of radiocalcium for research purposes. The use of this radioisotope makes possible an approach to various lactational problems in the intact animal without resort to nonphysiological concentration levels. Methods of analysis for radiocalcium in biological material have been developed by Comar et al. (3), and procedures for the use of radioisotopes with large animals have been described by Hansard (10) and Hansard et al. (11). Basic information on the behavior of Ca₄₅ in beef cattle has been reported by Hansard et al. (12). Visek et al. (20) have reviewed the literature on Ca₄₅ studies in lactating ruminants and have carried out such investigations with lactating goats. No reports have been found on the use of Ca₄₅ in research with the dairy cow, probably because of the lack of suitable techniques and the high cost of experimental animals, which are not usually salvageable after studies of this type.

¹ Postdoctoral Fellow of the Atomic Energy Commission.

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