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The purpose of this experiment was to produce germline chimeric ducks by transferring the primordial germ cells(PGCs)from the different duck species.PGCs about 200 as the donor cells from the gonads of the advance incubated donor Muscovy duck embryos was transplanted into the blood circulation of the advance incubated embryos of the Brown Tsiya ducks as the injected recipient target by the microinjection technology, and was recovered to perform the migration movement continuously by nature in the blood vessels of these recipient embryos. The Brown Tsiya ducks(BT) injected with the PGCs of the Muscovy duck(M)to produce germline chimeric ducks are referred to as BT(M). According to the reference of the development stages of the chicken embryos, the desired development stage of the duck embryos were confirmed. On the basis of comparing the embryo size of the chicken and the duck, and descripting characteristics which was used for dividing each development stage of the chicken embryo, it is most proper to produce germline chimeric ducks by transferring the microinjected PGCs which were isolated from the gonads of the 7 to 9-day-old incubated Muscovy ducks embryo whose development stage was equal to the 5-day-old (stage 27)chicken embryo into the blood circulating vessels of the 3 to 4-day-old Brown Tsiya duck embryo whose development stage was equal to the approximately 2.5-day-old (stage 14~17; 50~53 hours ~ 52~64 hours)chicken embryo. Just before performing microinjection, the average survival rate of PGCs was 75.2%. Random amplified polymorphic DNA polymerase chain reaction(RAPD PCR)used in this experiment was to detect that if the DNA which was extracted from the ganads of the injected recipient Brown Tsiya duck embryos contained the foreign DNA which was extracted from the PGCs which were isolated from the donor Muscovy duck embryonic gonads , and then was transferred into the injected recipient Brown Tsiya duck embryonic blood vessels by the microinjection technology. Therefore, the available genetic markers presenting the foreign DNA polymorphism which could be used to distinguish the differences between the donor duck embryos and the recipient ones should be found by using a certain primer from many tested ones. Then this primer would be applied to detect if the injected embryos contained the foreign DNA which would result in the specific foreign DNA polymorphic genetic markers, and thus to identify that the survival injected embryos would develop to be the germline chimeric ducks supposedly.The results showed that there were 13 of the 73 dead embryonic DNA samples presenting the specific electrophoretic band which Muscovy duck possessed, but Brown Tsiya duck did not have at approximately 410 kb, so containing the foreign DNA from the donor duck embryos to be confirmed by this method. Finally, there were 8 injected embryos which were hatched, but 3 of those died within 1 or 2 days separately, thus only 5 survival ducks. In the 5 ducks, the 3 ones were BT(M)in which the first two were female, and the third one was male, and the 2 others were M(BT)in which the first one was female and the second one was male. The total 5 hatched recipient ducks were brought up to sexual maturity. All of them were fertile, so they were mating with the oppositely sexual and pure M or BT duck species, and will be identified whether they are the germline chimeric ducks or not by the feather colour or the figure of their progenies further.
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