Sounds absolutely awful. Found this:
"Fortunately, buffalo gnats are daytime biters and rarely venture indoors. So one thing you can do is go inside if the gnats are biting. Providing shelters for poultry may help, since the flies don’t like enclosures. Secondly, you can provide screen-wire enclosures for your birds that block black fly biting. Although not specifically labeled for black flies, there are on-animal products labeled for mosquito and biting fly control that you can apply directly to chickens.
Many of these products contain the active ingredient permethrin. One example is Permectrin II® spray insecticide. Another product, called Ravap®, has different active ingredients (tetrachlorvinphos and dichlorvos) and may also be used directly on poultry.
Remember to read and follow all label directions for exact amounts and dilutions for these and any other insecticides, especially when using on-animal products."
"Fortunately, buffalo gnats are daytime biters and rarely venture indoors. So one thing you can do is go inside if the gnats are biting. Providing shelters for poultry may help, since the flies don’t like enclosures. Secondly, you can provide screen-wire enclosures for your birds that block black fly biting. Although not specifically labeled for black flies, there are on-animal products labeled for mosquito and biting fly control that you can apply directly to chickens.
Many of these products contain the active ingredient permethrin. One example is Permectrin II® spray insecticide. Another product, called Ravap®, has different active ingredients (tetrachlorvinphos and dichlorvos) and may also be used directly on poultry.
Remember to read and follow all label directions for exact amounts and dilutions for these and any other insecticides, especially when using on-animal products."