In this paper, efficiency of different short-term tree breeding strategies based on backward selection was studied when a new tree breeding project was initiated.

主要研究在启动一项林木育种项目时，基于后向选择的不同短期林木育种策略的效率。

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At present, early test in tree breeding is often used in order to shorten breeding term and provide the excellent materials for forest production as soon as possible.

目前为了尽快的缩短林木育种周期并为林业生产尽早地提供优良繁殖材料，经常采用的方法就是林木早期测定。

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We can see its family tree - and its daddy was a virus that evolved in the artificial breeding ground of a vast factory farm in North Carolina.

我们能看到这个病毒的谱系，它的上代病毒是北卡罗莱纳州一个大型集约化动物农场的人工繁殖基地中演化出来的一个病毒。

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The main advantage of using genetic markers is that it speeds up old-fashioned breeding methods, because you no longer have to wait for the tree to grow up to see if it has the desired traits.

ECONOMIST: Genetic engineering: Gone is the forest primeval | The