From September 2000 to September 2003, frozen embryo transplantation of Angus, Holstein and Piedmontese was operated in nine towns in Datong County.

• 2000年9月至2003年9月,在大通县青林、多林、逊让、向化等9个乡镇开展了安格斯牛、荷斯坦、皮埃蒙特牛冷冻胚胎移植工作。