D. Waberski et al., FERTILITY OF LONG-TERM-STORED BOAR SEMEN - INFLUENCE OF EXTENDER (ANDROHEP AND KIEV), STORAGE TIME AND PLASMA DROPLETS IN THE SEMEN, Animal reproduction science, 36(1-2), 1994, pp. 145-151
Each of 359 ejaculates from 20 boars was diluted 1:10 either in Androh
ep or in Kiev medium and then compared for their fertilizing capacity
on Days 2 and 4 (Trial I) or on Days 3 and 5 (Trial II) of storage. Fi
rst services with 3100 sows and gilts were performed by professional A
I technicians. Semen in the Androhep medium used on Day 4 produced hig
her pregnancy rates than inseminations with Kiev-diluted semen (77.8%
vs. 68.5%, P less-than-or-equal-to 0.05). Pregnancy rates and average
litter size were equal for inseminations on Day 2 and Day 4 with semen
diluted in the Androhep medium. This was in contrast to Kiev-diluted
semen. The average litter size decreased significantly with both exten
ders for Day 3 and Day 5 inseminations. There was a negative correlati
on between the percentage of spermatozoa with distal plasma droplets a
nd both pregnancy rate and litter size with semen used on Days 2 and 4
. The incidence of plasma droplets should not exceed 15% in ejaculates
used for AI especially with stored semen.