The efficiency of indirect selection to 300-EPD by 8-SAAW as the secondary trait was 1.4519, 1.4837 and 1.1887 times as large as individual selection, family selection and combination selection, respectively.

• 利用8周龄血清AKP活性作为辅助性状对300日龄产蛋量进行间接选择；其间接选择效率为个体选择的1.；4519倍；为家系选择的1