On December 22, it was learned from the China Agricultural University that the world's top Holstein bull was successfully cloned in China. At present, the two cloned youngsters named Dalong and Erlong have reached the age of one half. The appraisal committee unanimously agreed that the overall efficiency of the somatic clone production technology of the top Holstein breeder bull has reached the international frontier level. It is also another major development in the field of animal cloning in China. According to reports, the use of somatic cell cloning technology to protect and expand the top Holstein bull will fundamentally change the backward situation of China's dairy industry, resulting in huge economic and social benefits. According to reports, China Agricultural University, under the funding of the Ministry of Science and Technology, the Ministry of Education, the Ministry of Agriculture, and the Beijing Municipal Commission of Science and Technology, cooperated with a number of units including the Beijing Dairy Cow Center and Shandong Liangshan Kelon Livestock Industry Co. Research and Application of Cell Cloning Technology in Production of High Quality Bulls . Dr. Li Ning of China Agricultural University and his research group conducted systematic research and experiments on the somatic cell cloning technology of the top Holstein bulls, and achieved a breakthrough. In February 2003, the researchers collected samples of the outer ear skin tissue from the top bulls including the “Dragon†at Yanqing Base of the Beijing Dairy Cow Center and isolated skin fiber cells for cloning. A total of 65 blastocysts were bred, of which 34 were transplanted into 15 Luxi Cattle recipient uterus. A total of 9 cows were pregnant. Five of them had been pregnant for more than 7 months. Four cows gave birth to five cloned bulls. On the morning of March 11, 2004, the first cloned individual of the breeding bull “Dragon†was born successfully. The cloned cow was born with a weight of 36 kilograms and was in good condition. On March 17, the second cloned individual of “Dragon†was successfully born. . At present, the two cloned bulls are very strong and are half a year old. At present, the research results have passed the identification of scientific and technological achievements organized by the Ministry of Education. The appraisal committee unanimously believes that the overall efficiency of the somatic clone production technology of the top Holstein Bull has reached the international frontier level. For the successful cloning of the world's top breeder bull "Dragon", Comrade Zhu Keji was very happy. On May 1, 2004, he was pleased to name the two clones Dalong and Erlong, and wished the Chinese "cloning". Xinglong." According to statistics, the total milk output in China is only 2.5% of the world's total output. In 2002, China’s per capita milk consumption was 10.9 kilograms, equivalent to only 1/9 of the world’s per capita level, and 1/25 of the average level of developed countries. The shortage of milk sources, especially the good-quality dairy cows, is a huge obstacle to the development of China's dairy industry. At present, the current breeding situation of breeding bulls in China is worrying. The breeding of breeding bulls mainly depends on imports. In recent years, due to the discovery of mad cow disease in Canada and the United States, China has stopped importing semen, embryos and related products of live cattle and cattle from these countries. It is expected that after 2 years to 3 years, most of China's current outstanding species of bulls will be eliminated, and the emergence and gradual maturity of somatic cell cloning technology in China will undoubtedly provide a short cut for China to obtain the top species of bull in a short period of time.
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