REPRODUCTIVE EXPLOITATION OF AI BOARS ON THE INTENSIVE FARM UNITS IN AP VOJVODINA (SERBIA)

Lower fertility of artificial inseminated (AI) sows, compared with natural breeding is often problem in pig farm practice. Overextension of ejaculate for AI doses formation was frequently demonstrated as the factor for these lower AI sows fertility. The aim of the present study was to investigated the number of AI doses per ejaculate and the ejaculate dilution proportion on the intensive pig production farms unit in the AP Vojvodina (Serbia). Data from the farm reproduction records were used, for investigation 28 AI boars on the two farm units. Average 50.3 ejaculates per boar per year were taken (ie. one ejaculate per week, or average 611 ejaculates per boar per week). Average 12 AI doses were formed per ejaculate, with average 1:3 dilution proportion of native ejaculate. The obtained data demonstrate low number of ejaculates per boar per year, low AI dose number per ejaculate and not high ejaculate dilution proportion. The values of the examined parameters indicate that they are probably not  the primary reason for the low fertility of AI sows on the intensive pig farms in AP Vojvodina (Serbia).