鸡垂颈病

例句：

1. 1. The chickens are suffering from a disease that affects their necks.
   这些鸡患上了一种影响它们的颈部的疾病。
2. 2. This disease is highly contagious and can quickly spread among the chickens.
   这种疾病极易传染，并且可以迅速在鸡群中传播。
3. 3. To prevent this disease, proper hygiene practices should be followed.
   为了预防这种疾病，应该遵循适当的卫生措施。