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。
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