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THE CONCENTRATION OF SODIUM, POTASSIUM, CALCIUM, INORGANIC PHOSPHATE, PROTEIN AND GLYCERYLPHOSPHORYLCHOLINE IN THE EPIDIDYMAL PLASMA OF BULL CALVES

During their passage along the epididymal duct the spermatozoa undergo several changes (cf. Bishop, 1961) which may be related to changes in the composition of the epididymal plasma. It is known that in adult bulls the epididymal plasma changes characteristically in composition from one segment of the epididymal duct to another (Crabo & Gustafsson, 1964; Crabo, 1965).

Employing the method previously developed by Crabo (1965), it was decided to perform analyses of the epididymal plasma of bull calves before or at the time when spermatozoa appear in the epididymal duct, and to compare the composition of the epididymal plasma in bull calves with that in adult bulls.

The material consisted of eighteen bull calves aged from 209 to 242 days, of Swedish Red and White breed, and crosses between this breed and