At that time, a few foresighted men began line breeding and inbreeding with the hopes of establishing a new draft breed.

当时，一些富有远见的男人开始行繁殖和近亲繁殖，与建立一个新的草案品种的希望。

These loci might be used as assistant markers for early selection in line breeding of ultra-fine wool sheep from Alpine type Chinese Merino.

部分位点可为中国美利奴高山型超细品系培育的早期选种提供辅助依据。

It is differ both from the method of "circulate line selection" for seed reproduction and from the method of "pure line breeding" for varieties development.

该方法既区别于单纯生产原种的“株系循环法”，也区别于选育新品种的纯系育种法。

This photosensitive male sterility (PGMS) line produced by the expression of antisense-OsPDCD5 could be applied in production of hybrid rice using two-line breeding system.

这个通过基因工程的方法获得的光敏雄性不育系可应用到“两系法”育种中，用以生产杂交水稻。

Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.

已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。