The egg size and index of egg shape were measured to study the effect of egg size and index of egg shape on the hatchability of breeder egg of Heifeng hen.
测量了黑凤鸡种蛋的蛋重和蛋形指数，研究蛋重和蛋形指数对黑凤鸡种蛋孵化率的影响。
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