The objective of this study was to verify the fertility of cryopreserved boar sperm by heterospermic insemination performed by a mix of a liquid stored and post-thaw sperm. The second objective of this study was to utilize the benefits of a liquid stored insemination doses to reduce a negative impact on fertility results after post-thaw insemination performed by cryopreserved sperm. The results of paternity showed that the sires of all the born piglets were boars used as producers of liquid stored sperm. Cryopreserved sperm was unable to compete with liquid stored sperm in heterospermic insemination doses.