20 1 March1In the early morning of the 8th, the office of embryo engineering and reproductive technology of Beijing Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences obtained1cloned bull by caesarean section in Changping experimental cattle farm. The cow is pregnant for 279 days, and the calf weighs 58.2 kilograms. At present, all physiological indexes are normal. It was identified by Beijing Huada Fang Rui Identification Center that the cloned offspring was consistent with the donor bull DNA derived from cells.
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Application of cloning:
The research on transgenic animals is one of the most attractive and promising topics in the field of animal bioengineering. Transgenic animals can be used as donors for medical organ transplantation, as bioreactors, as well as for genetic improvement of livestock and the establishment of experimental models of diseases. However, there are not many practical applications of transgenic animals at present.
In addition to the medical model of transgenic mice modified by single gene earlier, the research on the production of drug protein by mammary gland bioreactor of transgenic animals has been going on for a long time, which has exceeded 10 years, but at present, only 2 drugs have entered the phase III clinical trial and 5-6 drugs have entered the phase II clinical trial in the world. However, transgenic livestock strains whose agronomic traits have been improved and can be used for livestock production have not yet been born.
Baidu Encyclopedia-Cloning