Semen: gel fraction
- The gel fraction (mainly from the vesicular glands being removed from an ejaculate by syringe aspiration.
- Semen is much easier to handle and examine once this gel has been removed. Due to its cohesive nature, the gel is easily removed in this manner.
- An alternative method is to filter off the gel using a milk filter.
- Many sperm are lost by both methods but these losses are not significant: usually 200 to 1200 million sperm remain in the filtrate.
- Sperm numbers are lower at the onset of the season and rise towards mid-summer.