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INTRACELLULAR LEVELS OF SODIUM AND POTASSIUM IN BULL SPERMATOZOA IN RELATION TO CELL METABOLISM

Spermatozoa in a variety of mammals have been found to contain significantly more potassium and less sodium than the seminal plasma (Quinn, White & Wirrick, 1965). Similar differences in concentrations of these ions between spermatozoa of marine invertebrates and the sea-water environment have also been reported (Steinbach & Dunham, 1961). Quinn et al. (1965) employed the packed wet cell weight of spermatozoa for calculation of sodium and potassium content of the cells, and on this basis found evidence for active extrusion of sodium and accumulation of potassium by spermatozoa of dog (Quinn & White, 1967), bull and ram (Quinn & White, 1968). Steinbach & Dunham (1961) measured both wet and dry weight of pelleted spermatozoa and thus were able to derive the concentration of alkali cations in the intracellular fluid, assuming the latter to be represented by the difference

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