ANOVA and LSD (SAS) were used to process the data obtained,It was indicated that the content of Ca and P in the yolk sac within 2 hours after hatching were about 27mg and 45mg,respectively.

• 试验表明,雏鸡出壳2小时内卵黄囊中钙(Ca,下同)的含量约为27mg,磷(P,下同)的含量约为45mg。