There are many factors affecting transgenic farm animals production. One of them is the effectiveness of the transfer of zygotes and embryos obtained after DNA microinjection. Low effectiveness of the transfer of potentially transgenic blastocysts in cattle is due to their decreased developmental potential in comparison to the blastocysts developed from not microinjected zygotes. A simple short term in vitro culture used for rabbit zygotes after microinjection increased twice the number of produced potentially transgenic rabbits.
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J. Jura, Zaklad Fizjologii Rozrodu Zwierzat, Instytut Zootechniki, 32-083 Balice, k. Krakowa, Poland e-mail: firstname.lastname@example.org