WHY DON'T ANTS EAT CONVENTIONAL GRAINS? And very few bugs and seldom flies. What is the secret ingredient added to the feeds that keeps pests (insects) from desiring conventional grains? Are there residual traces left within the animal being fed? Also transferred to eggs as well? Meats? Have there been any studies that could provide data proving the added chemical is totally harmless? When mother nature's most efficient scavengers won't mess with it. Ants will eat everything, except conventional grain. Below are some of the Guaranteed analysis tags off of some of the brands we use. All brands/types share some of the same ingredients. BUT which ingredient is the ANT REPEL-ER? Natural or man made.