The first cloned cattle was bred by freezing technology in China

Introduction: weighing 40 kg and 80 cm in height, it is the first somatic cell clone cattle in China that has been developed by vitrification technology It was born in Liangshan County, Shandong Province at noon yesterday Up to the time of press release, the black and white dairy cow, weighing 40 kg, sprang and ate freely The cloned cow's nuclear donor comes from the ear skin fibroblasts of a high-quality black-and-white cow with an annual output of more than 10 tons of fresh milk This cow comes from Beijing dairy center After being vitrified and frozen, the cloned embryo was transferred to a Luxi cattle After 281 days, a healthy black and white cow was born at 11:52 yesterday The cloned cow was born with a weight of 40 kg, a height of 80 cm, a body length of 72 cm, a chest circumference of 80 cm and a tube circumference of 11.5 cm At 14:20 of the day, colostrum began to stand at 14:30 That night, colostrum was able to cry, lie down and jump, which was no different from the signs of normal born cows This is the first somatic cell cloned cow in China Before that, the technology of fresh embryo transfer has been used in our country, and there is no precedent of using freezing technology to clone successfully Vitrification and freezing technology is one of the important technologies for large-scale production of dairy cows by means of in vitro methods The success of this experiment laid a foundation for the industrialization of a large number of high-quality dairy cows in the future This project belongs to the national "863" major scientific research project, which is jointly developed by China Agricultural University, Beijing Gene Technology Co., Ltd and Shandong Liangshan Animal Husbandry Development Co., Ltd At present, the technology of somatic cell cloning is one of the hot and cutting-edge technologies in the field of biotechnology, which has broad application prospects in agriculture, biology, medicine and other fields Liangshan county is the base of national "863" cow transgenic research project in Shandong Province At present, another three of the first batch of cloned cattle have entered the state of labor, and another two transgenic cloned cattle have also been pregnant, and will enter the pre delivery period in February next year.