IT IS... poisonous. ....I would use coffee grounds instead to take care of the ants that way you don't hurt your chickens.. I myself would never use anything with chemicals since I've gone to organic farming and raising of my chickens and fowl.
Just an FYI, most coffee is not organic at all. It is one of the most heavily pesticide ridden items we can buy. Most coffee is grown outside of the USA and is only slightly "regulated" against pesticide use and even child labor. I drink Death Wish coffee. It packs a punch and is 100% Organic and Fair Trade. It is priced higher than most coffee but you don't need to drink as much either.
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