Insemination of sows with cryopreserved boar sperm tended (P = 0.06) to reduce pregnancy rate, an effect ameliorated
by thawing sperm into extender with 50% seminal plasma (Table 1). There was no significant effect of treatment
on farrowing rate. Insemination with cryopreserved sperm was associated with a reduction in total born litter
size (P < 0.05), an effect not observed when sperm were thawed in 50% seminal plasma