Traps would probably work better than deterrants when it comes to skeeters, but!I know this isn't meant to be funny, but if we get chicken pox, why don't they get people pox . . .hmmm?
On a serious note is there something I can put in their coop/run to deter the mosquitoes?
Lemon grass, lemon balm, lavender, marigold, and some mints like catnip or peppermint can help repel them. Definitely not foolproof though.