Researchers at the Institute of Regenerative Medicine at Kyoto University in Japan have implanted foreign genes into mouse sperm and successfully developed young mice with foreign genetic traits. According to newspaper reports here, the scientists used a week-old pups to experiment and implanted foreign genes into immature spermatogonia in their testis. After the spermatogonia grew into spermatozoa, it contained foreign substances. The sperm of the gene is selected, in vitro fertilized, and then placed in the mother's womb, and finally a young mouse having a foreign gene trait is cultivated. Experts believe that the cultivation of transgenic animals by implanting exotic genes into sperm can significantly increase the efficiency of breeding transgenic animals compared to the use of embryonic stem cells, reducing the number of animals required by 90%. If it reaches a practical level, this technology will help establish an efficient "animal factory" and greatly reduce the cost of raising high meat quality and excreting livestock containing useful substances such as vitamins.
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