Two scalp cell cloned cattle passed expert identification in China

Introduction: "Kangkang" and "Shuangshuang", two scalp cell cloned cattle in China, have recently passed the identification of domestic experts in Laiyang Agricultural College, Shandong Province The appraisal committee is composed of eight experts, including the president of the Chinese society of zoology, the chief scientist of giant panda cloning in China, and Professor Chen Dayuan of the Institute of zoology, Chinese Academy of Sciences After analyzing the DNA of the two calves, experts believe that the genetic material of cloned cattle is not related to the cow, but consistent with the calf that provides cells, which proves that the two calves are indeed cloned cattle Experts fully affirmed three unique technologies in this study: one is to use click to remove the nucleus method, which causes little damage to oocytes; the other is to use negative pressure gas-phase system to reconstruct embryo culture, which effectively improves the blastocyst development rate; the third is to use cells cryopreserved at minus 35 ℃ as nuclear donors, and achieved success Compared with the international cloning technology, experts believe that this research achievement has reached the international advanced level and reached the international leading in some technical aspects Experts pointed out that this technology has a broad application prospect and will play a great role in promoting the industrialization of bovine embryo engineering technology in China It is understood that the growth of these two cattle is in good condition and all physiological indexes are normal The results of 22 day's weight measurement showed that "Kangkang" had reached 71 kg, while "Shuangshuang" had reached 71.5 kg, growing fast.