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The study concerned examination of 120 of young Pietrain and Duroc boars and hybrids descending fromreciprocal crossing of those breeds. On 230th, 250th and 270th day of their lives, their sperm was given a detailedexamination. It is assessed that Pietrain boars gave ejaculates of the lowest volume, lowest mobility, and thelowest total number of spermatozoa. Semen of boars of this group had also the highest percentage ofspermatozoa with major and minor morphological changes, and defected acrosome. Along with the age of boars(from 230th to 270th day of life) there was a significant improvement of quality of semen of all of the groupsexcept the semen of Pietrain boars.  We detected the positive effect of crossing especially in hybrids boars descending from mating of Duroc fathersand Pietrain mothers. Even during the first evaluation, they gave the semen of the highest total number of normalsperms, with normal acrosome, and with the highest value of osmotic resistance test and the lowest activity ofAspAT in semen plasma. That proves the high quality of ejaculates of those hybrids comparing to the ejaculatesof the boars of other groups – purebreds as well as hybrids of the opposite combination, i.e. descending fromcrossing of Pietrain fathers and Duroc mothers. This conclusion suggests to use Duroc fathers and Pietrainmothers in production of hybrid boars

Quality of semen of young boars of the breeds Pietrain and Duroc and their reciprocal crosses