Sperm from a pedigree bull is artificially inseminated; a few days later the fertilized ova are washed out of the fallopian tubes and transferred to the uteri of ordinary cows. In this way they will give birth to superb calves.

• 用一头纯种公牛的精子进行人工授精，几天后将受精卵从输卵管冲出，移植到普通母牛的子宫里。这样就生出优良的小牛。