1, improper preservation of eggs;
2. The eggs are shaken or the heads are transported downwards;
3, genetic factors;
4, lack of nutrition, such as: biotin, riboflavin, zinc or manganese;
5, turning eggs is not sufficient;
6. The orientation of the eggs is not suitable, for example: small head up;
7. The temperature of the incubator is low or high;
8, diseased chickens;
9, lack of ventilation, eggshell is too thick or a small number of stomata.
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