What is the batch breeding technology of in vitro embryo production of dairy cows?

Public trust. Com Yinchuan 65438+1October 3 1 This newspaper (Reporter Li Peishan) Reporter 3 1 It was learned from the Propaganda Department of Lingwu Municipal Committee of Yinchuan City, Ningxia that lingwu city and Northwest A&F University * * * have made a major breakthrough in the research of in vivo egg collection-in vitro embryo production and embryo transfer technology. The first batch of in vitro embryo production and transplantation cows were born and grew up healthily in Xingyuanda Agriculture and Animal Husbandry Company, Lingwu breeding base. This is the first time that China successfully built a laboratory on the farm. Under the condition of not affecting the normal breeding plan, in vitro embryos were produced efficiently by collecting eggs from living bodies, and the improved cows were finally equipped with "Chinese core".

"It was born weighing 37 kilograms, 66 centimeters tall and 44 centimeters long. This calf is healthy and functioning normally. " Li, a doctoral student at Northwest University, told the reporter that the first calf in Ningxia (OPU-IVP) finished eating for the first time half an hour after birth. After an hour, the calf can stand on its own. According to the preliminary observation and measurement by the expert group, the calf meets the standard of newborn calf.

A newborn calf. Photo courtesy of Propaganda Department of Lingwu Municipal Committee

It is reported that the success of in vitro embryo production has established a new system of OPU-IVP-ET and cloned embryo transfer technology without affecting the normal breeding plan of the farm. Using this technology, 20-30 oocytes can be collected intensively at a time, and the maximum number of oocytes can be recovered. About 5-9 transplantable embryos can be obtained from each egg collection, and the success rate of transplantation is stable at about 50%, reaching the international advanced level.

It has a long history for lingwu city to build a modern scientific and technological innovation system of dairy cow seed industry, which is enterprise-oriented, market-oriented, talent-based and Industry-University-Research-based. After in-depth cooperation with Northwest A&F University to develop and improve the rapid breeding technology of dairy cows, the first phase completed 120 cloned cattle embryo transfer and 41live egg collection-in vitro embryo production cattle transfer. Up to now, the first batch of in vitro embryo production and transfer has given birth to 36 cows. Newborn cows are normal in physique and healthy in clinical examination It is estimated that 300 newborn cows can be produced.

A newborn calf. Photo courtesy of Propaganda Department of Lingwu Municipal Committee

At the same time, the milk yield of each embryo produced by in vitro embryo transfer is about 4 times higher than that of ordinary cows. "In the long run, if there are enough such high-quality cows, an improved dairy core group can be established. Bull calves produced by new technology also have the potential to become bulls. In the future, we are expected to rely on improved bulls and improved cows with independent intellectual property rights to achieve independent reproduction. " Xiao Jinbang, a doctor at Northwest A&F University, said.

At present, the average annual milk yield of dairy cows in Ningxia is about 10 ton, which is in the middle and upper reaches of the country. The highest annual milk yield of improved cows in the world is nearly 36 tons, and the highest lifetime milk yield can reach 209 tons. Jin Yaping, a professor at Northwest A&F University, the head of the dairy seed industry innovation team of Northwest A&F University and the president of the National Lingwu Dairy Science and Technology Research Institute, said that the collection of live eggs-in vitro embryo production and embryo transfer is the top technology of dairy cattle breeding in the world at present, and it is also a new track for competition among countries. Making full use of the outstanding individuals in dairy cattle group and carrying out the industrial production and application of improved in vitro embryos will comprehensively improve the life span, milk yield and milk quality of dairy cows and provide strong technical support for promoting the high-quality development of dairy industry in Ningxia. (End)