It's pox virus. Some of your birds will get and others will not. Try to isolate the infected birds. Add a table spoon of bleach per gallon of fresh water daily to prevent spread via water in all birds. Wild birds, yard birds your shoes, hands, etc. will spread the disease. Good bio security...
I have sold or culled my Ganoi, some Thai, Indian Asil and other birds to focus on the 3 lines of Shamo I have. The ones below are my breeding out of Suzann Chungs line of O Shamo.
Kad,
These are 3-4 month old O Shamo stags and pullets. This line of O Shamo, as with most big birds in the 10lb plus range, do not reach their full potential, in development and ability till 12-18 months.
In my mind, they have a long way to go. There is always some thing to work on with any...