bred selectivelyの例文

• The problem is that the mares have little or no value, except on a few farms where they are bred selectively for working or riding stock.
• Over thousands of years, he said, Zea apparently was bred selectively until finally it became the familiar corn, with rows of seeds on a cob.
• The gene for white coating is quite common among Bengal tigers, but the natural birth of a white Bengal tiger is still a very rare occasion in the wild, where white tigers are not bred selectively.