Still more inclined to put it on my chicken than on their food. 

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Hmmm... because most chicken feed manufacturers are adding it into their recipes. Kalmbach does. Why cant I? Read the label of your chicken feed before you start calling people witches.You can't possibly know the dosage using those ingredients. That makes it slightly more reliable, and slightly more dangerous, than prayer or magic. Nor do the studies (and I've read LOTS of them) look at the effects of regular feeding of the supposedly "good" stuff. It is entirely possible, likely even, that routine dosing simply selects for bacteria, parasites, etc more able to tolerate low amounts of the bioactive ingredients in the mint family, the same way routine addition of ACV to acidify your water selects for bacteria that do better in more acidic environments, and routine dosing of low dose antibiotics selects for germs in hospitals able to disregard it - things we now give lovely names like MRSA.
So, yes you can. Why would you? If you are doing it for antibacterial/antiparasitic properties, its because your Faith trumps your Science.
You don't know me from BYC, or you would know that I do read my labels, I hold hedgewitches in higher regard than you seem to think, and nothing I said above is even remotely questioned, being amply backed by study, experience, and known biological processes.Hmmm... because most chicken feed manufacturers are adding it into their recipes. Kalmbach does. Why cant I? Read the label of your chicken feed before you start calling people witches.
There's no health benefits in that spice mi
Not true.There's no health benefits in that spice mix.
There's no benefits in old, dried Walmart spice mix. If you want to fling herbs at your birds, hit a herb shop.Not true.