Five crossbreds of Polish Landrace and LargeWhite boars aged 2 to 4 years and selected according to normal semen
quality and proven fertility were used in this study. Preselection for semen freezability was performed. Sperm cryosurvivability was determined as a percentage of motile spermatozoa (totalmotility [TM]%) that survived the freezing
process: percentage of FT motile sperm/percentage of fresh motile sperm 100. In the experiment, good freezability
semenwith high cryosurvival rate of 60% or greaterwas used. Boars were kept at the Boar AI Station in Klecza Dolna.
All boars were housed in buildings with stable conditions of controlled temperature and humidity and were fed an adjusted commercial diet.