I worked as a vet tech and I can tell you that there is no 100% dose for any animal, it's all guess work. There is so little research on CBD and what it can do. I do know it's helped numerous people especially those going through chemo.
There are different mg's for CBD and a lot of the CBD...
I use cbd oil on my dog for seizures. She gets 15 drops a day, but hers is medical with thc in it to control her seizures.
I'm not sure on the dose with chickens, but I assume it would be 2 or 3 drops since they're not too large in size...
Does the CBD oil have thc in it? If it's without thc...