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Since you have alot of birds, you can use ivomec injectable 1% cattle ivermectin in their water...4cc per gallon of water. The mixture is the only water the birds get for 2 days. Repeat again in 14 days for lice/mites. The reason there's a withdrawal period for most wormers, except eprinex, is that it takes time for the wormer to go through the chickens system. It takes time to kill the worms, it takes time to expel the worms or be absorbed as protein and it takes time for the wormer to be expelled from the chickens system. Anyone who eats eggs within the 14 day withdrawal period can injest the wormer, however so slight, and possibly have a reaction. Remember, wormers are poisons designed to paralyze or kill worms. Also, there might be an accumulation factor involved til it's expelled. Withdrawal period for ivermectin pour on is 48 days for cattle slaughter. Fourteen days is a reasonable period for me to wait and eat the eggs. Yes, ivermectin is used in other countries to prevent 'river blindness.' Most wormers on the market are used in this country to get rid of internal parasites.(Ivermectin, wazine, fenbendazole and albendazole just to name a few.) When dealing with this stuff, I'll play it safe. What anyone else chooses to do is up to them.