Kingston D J
Aust Vet J. 1979 Sep;55(9):418-21. doi: 10.1111/j.1751-0813.1979.tb05593.x.
Observations made in a commerical broiler hatchery revealed that chicks hatched over a period of 48 hours. Chick mortality to 10 days of age was 3.2% for those hatched at the commencement of the hatch, 1.2% for those hatched at peak of hatch and 52.9% for those hatched at the end of hatching. Chicks hatched early were more prone to dehydration while late hatching chicks had a higher incidence of leg weakness. Chicks held for 48 hours in hatcher machines lost 12.5% to 21.7% of their hatching weight and 79.4% of the hatching weight of the yolk sac. Normal 10-day mortality from this hatchery in winter months was observed to be 2.4% but was reduced to 1.2% when staggered setting times of donor flocks was employed by removing chicks from the machines 3 hours after 100% hatch, but was increased to 5.6% by holding chicks in the hatchery in chick boxes for 24 hours at 70 degrees C.
在一家商业肉鸡孵化场进行的观察发现，雏鸡在48小时内陆续出壳。孵化开始时出壳的雏鸡到10日龄时的死亡率为3.2%，孵化高峰期出壳的雏鸡为1.2%，孵化结束时出壳的雏鸡为52.9%。早出壳的雏鸡更容易脱水，而晚出壳的雏鸡腿部无力的发生率更高。在孵化机中存放48小时的雏鸡体重减轻了12.5%至21.7%，卵黄囊的孵化重量损失了79.4%。观察到该孵化场冬季正常的10日龄死亡率为2.4%，但当采用供体鸡群错开入孵时间，在100%孵化后3小时将雏鸡从孵化机中取出时，死亡率降至1.2%，而当雏鸡在孵化场的雏鸡盒中于70摄氏度下存放24小时时，死亡率则升至5.6%。
