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Relationship of Glycerylphosphorylcholine to Other Constituents of Bull Semen¹

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

Glycerylphosphorylcholine (GPC), sperm numbers, fructose, and citric acid were measured in semen samples collected from five mature bulls twice every Monday and twice every Thursday for six weeks. Seminal GPC was significantly correlated with a) the numbers of sperm in first and second ejaculations (r = 0.72 and 0.53, respectively), b) the volume of semen of both ejaculations (r = 0.62 and 0.49, respectively), and c) the seminal contentof fructose (r = 0.41 and 0.43, respectively) and citric acid (r = 0.55 and 0.33, respectively). Glycerylphosphorylcholine in the semen was 14% greater after a four-day interval between ejaculations than after a three-day interval; none of the other measured constituents differed significantly in that respect. The results suggested that epididymal resorption of sperm was proportionately more rapid than that of GPC, and that measurement of both of these parameters in future experiments may provide simultaneous information on the secretory and resorptive functions of the epididymis.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article no. 3966.

² NIH Predoctoral Fellow.