The loss rate in commercial broiler breeders infected with ALV-J and intercurrent stressors can be as high as 1.5% per week in excess of normal mortality from approximately 20 weeks of age onwards.

• 损失率在商业烤焙用具交配动物者感染ALV-J和在过程中发生的致压力素可以向前是一样高象1.；5%25每个星期超出正常死亡率从大约20个星期年龄。