求翻译：采用引进的广西省广西三黄鸡和仙居县仙居鸡合成专门化父系（R系）；采用两代半同胞近交法，提纯该群体，经闭锁选育，将宁海县的当地鸡群形成专门化母系（D系）。根据生产需要和品系特征设计不同的杂交组合，通过配合力测定和杂种优势的分析，筛选出最佳配套杂交组合R♂×D♀。配套形成的振宁黄鸡商品代公母鸡分别在85和120日龄上市，上市体重分别为1350g和1416g，饲料转化率分别为3.54和3.98比1，成活率均在96%以上。是什么意思？

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