| To Landrace, Yorkshire and Duroc , LY (the hybried of Landrace boar and Yorkshire sow) , YL (the hybried of Yorkshire boar and Landrace sow) adopts artificial insemination and nature service two methods, and at swine artificial insemination use admixture semen method service sows also, study the influences of different species import swine' s fertility rates and breeding function circumstance, compare the influences of import swine' s fertility rates, nest average piglet number, piglet individual born heavy and nest heavy after adopted artificial insemination technique, and measured the semen collection records of Landrace, Yorkshire and Duroc boar, and discussed how to judge swine heat and service on time at apply and expansion swine artificial insemination technique, how to teaching boar and semen collection , artificial insemination effictiveness analyse , and how to extend the swine artificial insemination technology ect., and analyze the influence of sow fertility rates, piglet counts when use the same species and different species boar semen at the artificial insemination.This research conclusion is : compare to nature service, there is no significant influence of artificial insemination to import swine and LY or YL sows' fertility rates, piglet number ( P>0.05), the Influence of piglet born individual heavy and nest heavy does not show the difference ( P>0.05), elucidation artificial insemination technology can be adopted extensive to import swine. use one boar semen and mixed semen at artificial insemination has certain difference, mixed duroc semen is better than one Droc boar semen at artificial insemination. A duroc boar semen and a Yorkshire boar semen mixed is obvious better than one boar semen at artificial insemination., compare the nature service , the pregnant rate ,piglet amount all have the big exaltation, but here is no significant influence to piglet individual born heavy and the nest heavy; Amount of import boar' s semen is: Landrace > Yorkshire > Duroc.
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