The successful cloning of two of the world's top species of bulls indicates that China is expected to massively expand the quality of bulls. The two studs that were successfully cloned in Liangshan County, Shandong Province on March 11 and 17 of this year were the ones awarded by the government to China as “Dragon†when Comrade Zhu Keji visited Canada in 1999. The "replica" of the world's top Holstein bull. On May 1 of this year, Comrade Zhu Qiji named the two kinds of bulls "Dalong and Erlong" and wished "Clone is flourishing". Professor Li Ning, the chief scientist of the State Key Laboratory of Biotechnology at China Agricultural University, introduced that the development rate of the blastocyst of the cloned embryo was 48%, the pregnancy rate of the cloned embryo was 33.3%, and the birth rate was 20%. The overall rate has reached the international frontier level. The success of this project has paved the way for large-scale breeding of quality bulls in China. The bull "Dragon" is a genetically superior breed with an annual output of about 50,000 to 60,000 fine tubes in China (now the Beijing Cow Centre is priced at 30 yuan/thin tube), and the annual direct economic benefit is 1.5 million yuan; through artificial insemination, Each year, 15,000 high-quality and high-yield dairy cows can be produced. Calculating the annual output by 500 kg, the annual indirect economic benefit is 15 million yuan. The large scale expansion of bulls, especially the world's top breeders, is an urgent need for the development of China's dairy industry. The emergence and gradual maturity of somatic cell cloning technology has brought new means to the expansion of the top excellent bulls, and has overcome the difficulties faced by conventional breeding and direct introduction. The use of somatic cell cloning technology to expand the quality of bulls is very obvious advantages, you can get the best bulls in a short period of time; less investment, low production costs; to avoid the high-quality bull descent assessment of the funds and time consumption; maintain high-quality species The excellent production traits of the bulls prevent these traits from being lost due to breeding; the breed of bulls produced is more comprehensive; the sex of cloned cattle can be controlled. According to Li Ning, at present, there are six surrogate cows that are gestating and will soon have cloned individuals with “dragonsâ€. According to reports, the project was funded by the Ministry of Science and Technology, the Ministry of Education, and the Ministry of Agriculture under the auspices of the China Agricultural University. Shandong Kelong Animal Husbandry Industry Co., Ltd., the Beijing Dairy Cow Center and the Animal Husbandry Institute of the Chinese Academy of Agricultural Sciences jointly participated in the project. .
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