Ants can be a real problem when they invade the chicken coop. If you don’t take action, they will be in the feed, water, not to mention aggravate your birds with inflamed feet and legs from ant bites.
A Few Suggestions:
Best answer? Get a pair of Guineas and your ant problem will be gone for good.
If that’s not an option…
Mix a few cap fulls of orange oil in a gallon of water and pour it on the mound. Then put the mixture in a spray bottle and spray it directly on the ants away from the mound.
To keep ants away from the coop put a line of peppermint oil around the entire coop. I haven’t tried this myself, but I hear the ants won’t pass over the line.
When you have to go for the big guns, use Seven 5% under the bedding of the coop. It’s safe for chickens and it works. Just make sure you follow the directions for it’s proper use. Use a mask, gloves, long sleeves, and take a shower afterward. It is toxic. Kills bugs dead.
Note: Food grade diatomaceous earth doesn’t work! So don’t even bother with that.