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PNA独特的化学组成使其具有特异的杂交性能。
The unique chemical makeup provides PNA with unique hybridization characteristics.
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。
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.
波尔山羊在襄樊地区的生长发育、繁殖性能、抗逆性情况基本良好，在襄樊市的杂交改良效果也十分明显。
In Xiangfan, Boer goat is well basically in the facets such as growth development, reproduction performance and resistance ability while cross improvement result is remarkable too.
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