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Never Stop Improving Selection objectives for each line每个品系的选育目标4 Sire Lines4个公猪品系4 Dam Lines4个母猪品系Survival & Robustness存活率&抗病性Efficient Growth生长效率Reproduction繁殖力Carcass Traits胴体性状Within line selection品系内选育4 Sire Lines4个父系品系4 Dam Lines4个母系品系ECONOMIC ADVANTAGE经济优势