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But, healthy chickens raised on dirt, not filthy litter, will often have a good resistance to worms. That's why you can see some heavily affected, others not hardly, in the same flock.
As for ivermectin- I recently had a horrible experience. Worked my flock of 20 and two of the three E.Fayoumis ended up overdosed. One buttercup ( buttercups are said to be related to Fayoumi) also had milder sxs. Almost lost the Egyptians, one was comatose for two days! Makes me wonder if the Egyptians are genetically unable to metabolize ivermectin like normal? Even my OEGBs, which are tiny, were fine. I'll be switching to other workers from now on.
This was the first time in 20 years, BTW, that I've ever worked. I only did it because I felt, since they are in a tiny yard rather then fully free-ranged, as I've always raised chickens before this flock, that I should worm the, from now on, I'm checking a fecal egg count, first. No more worming just because for my little flock!
Healthy chickens raised on dirt DO get worms, where do you think the worms come from in the first place? Your soil conditions dictate how much worm oocysts are in the soil. In Mesa, I suspect your soil is sandy and dry most of the year...it would have less oocycts in your soil, less condusive for worms. It depends on the soil conditions/environment where you live. One roundworm lays thousands of eggs a day that are shed onto the soil to be picked up by your other birds. Not having filthy litter is common sense in flock management.
I agree birds will pick up worms even if raise on wire......main reason other bugs are host to the worms.
I use both safe guard and ivomec....Wazine is a waste only kills round worms......which safe guard does...ivomec kill worms ,mites ,and lice.
beetle,earwigs,grasshopper,earthworm,slug,snail,termite,dragonfly,and mayfly all can be host to parasitic worms.
Yes chicken eat most of these...if on the ground or freerange ,they will pick up more like earthworms, but reason why everyone should worm their birds...depend on your location some more than others.