SOWS FERTILITY AFTER INTRACERVICAL OR POSTCERVICAL INSEMINATION WITH REDUCED SPERMATOZOA NUMBER IN AI DOSE

The aim of this study was to determine whether the application of intrauterine (postcervical) AI, with twice reduced volume (50 ml)
and the number of sperm (2x10⁹) doses can increase the sows fertility, compared to the classical intracervical insemination (dose volume 100 ml with 4x10⁹ spermatozoa). After classical intracervical insemination, farrowing rate was significantly lower (67.5%) only after classical intracervical AI, with reduced spermatozoa number per AI dose (P<0.01). Using new intrauterine (postcervikalne) AI technology, the farrowing rate were not significantly different (P>0.05), depending on the number of spermatozoa number in AI dose (83.3% and 79.2%). The results show that the use of intrauterine insemination, with doses twice reduced in volume and sperm count, can significantly increase the reproductive efficiency of the AI boars.