The present study determined the effect of different types of sugars (lactose, fructose, glucose and sorbitol) used in egg yolkbased
extender on the post-thawed boar semen quality. Twenty-two ejaculates from 6 fertility-proven Yorkshire boars were cryopreserved
by liquid nitrogen vapor method. Sperm motility, viability, acrosome integrity and intact functional plasma membrane were determined
at 0, 2 and 4 hr after thawing. It was found that the lactose-based extender resulted in a higher percentage of post-thawed sperm
motility, viability, intact acrosome and functional plasma membrane than sorbitol-based extender (P