We are having an awful time with flies in our poultry pen. We have chickens, geese, 1 duck and 1 turkey in a 30 x 30 pen with a 4 x 18 foot coop that lets the chickens and turkey have their own areas away from the geese and duck. They also have two small ponds with a stream between them. We've been putting down fresh hay every day and raking the yard every two to three days as well. We also got some fly traps, those jars with fly bait that we've hung around the coop. A worker at our local farm store suggested we get a spray that is used for horse stables to kill the flies out but all the cans of spray we looked at said any birds had to be removed before it could be used. Has anyone used any of these sprays with success without hurting their birds?