Relationship of Glycerylphosphorylcholine to Other Constituents of Bull Semen

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Abstract
Glyeery1-phosphorylcholine (GPC), sperm numbers, fructose, and citric acid were measured in semen samples collected from 5 mature bulls twice every Monday and twice every Thursday for 6 weeks. Seminal (GPC) was significantly correlated with: the numbers of sperm in 1st and 2nd ejaculations (r=0.72 and 0.53, respectively); the volume of semen of both ejaculations (r=0.62 and 0.49, respectively); the seminal content of 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 4-day interval between ejaculations than after a 3-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.