Motility
An estimate of motility provides an indication of sperm viability.
Within certain ranges, motility is not highly related to subsequent fertility(farrowing rate & litter size).
Sperm can be viable without being motile
- Many factors can influence motility. Temperature is the most important factor when evaluating semen on the sow farm.
Sperm can be motile, but not fertile.
In general, expect viability to decrease as storage time increases.