36 The Biochemistry of Semen 



a means for the evaluation of the contribution of the seminal vesicles. 

 From the results of this study (Table 7) it can be seen that in 

 ejaculated semen (liquid portion), the sperm concentration was 3% 



Table 7. Composition of ejaculated semen, epididymal semen, and 

 seminal vesicle secretion of the same boar 



(Four ejaculates were collected from the same boar, at weekly intervals. 

 The boar was then killed, and the epididymal semen and vesicular secretion 

 collected. For chemical analysis, the fluid portions were used, separated 

 from sperm and gel by centrifugation. In the case of ejaculated semen, the 

 means (and standard deviation) are given per single ejaculate.) 



vesicle secretion. In semen collected from the boar by the 'split- 

 ejaculate method' it is possible to distinguish clearly three distinct 

 fractions. According to McKenzie et al. (1938), the pre-sperm 



