The modern laying strains are bred for high egg production. 近代產(chǎn)蛋品系的培育，目的是為了高產(chǎn)蛋量。
The results also showed that the increasing effect of long storage time and the later stage of laying cycle on hatchability. 越是產(chǎn)蛋后期，種蛋貯存時(shí)間越長(cháng)，對孵化率影響越大。
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