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。
The traditional line selection and cross breeding is one of the most effective ways to cultivate improved varieties.
传统的家系选择和杂交育种是培育优良品种最有效的方法之一。
The traditional line selection and cross breeding is one of the most effective ways to cultivate improved varieties.
传统的家系选择和杂交育种是培育优良品种最有效的方法之一。
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