Alot of things aren't approved for poultry due to eggs and meat consumption so that kind of makes sense. Dosent mean you can't use it though.
We had a hawk scare a few weeks ago where after she got attacked she acted pretty skittish for a few days but then went back to normal so the vet perscribed equisul sulfadiazine/trimeth for any internal infection or whatever. The weird thing is that when I google the medication all that comes up is horses.