5. The diluted semen is held at this temperature +5ºC for
at least 2 h equilibration time. Straws are filled and sealed
by using an automatic filling and sealing machine capable of
filling 2,000 straws per hour. Semen is sucked into the
straws and on meeting the polyvinyl alcohol powder plug at
one end and impervious seal is made. The other end is
pinched together and cold sealed. The semen is being
checked for individual motility while the straws are held at
5ºC for another 2 h equilibration. After equilibration, a
minimum of 4 h, the straws are then ready for freezing by
one of the two methods: