I'm curious, what were the supposed general "negative consequences" of using the tumeric, cinnamon and cayenne? Was it using all 3 of those herbs in those quantities they said had negative consequences, or was it something different? I know it was 5 years ago, but perhaps you have a better memory than I do!
That was a typing error. It was supposed to be "withOUT supposedly negative consequences." Sorry for the confusion.
Personally I think a larger amount of dried, powdered tumeric, cinnamon, and cayenne can be used, but those studies (from years ago) indicated those amounts were the upper limits for inclusion in dry feed. But the studies did claim that a difference was made in chicken health with only that small amount, which is good news by way of thinking.
Additionally my layers get hot/mild pepper tops/stems and seeds often in addition to the dry powder in their feed about every other day--the most is probably the remains of about 8 peppers for about 20 chickens. I have never detected flavor issues. I have no way to prove that anything I am feeding my chickens is beneficial ... other than they act like my idea of what chicken do ... lay eggs, scratch the ground, grow feathers, roost at night, eat, etc.
I will post that article about green tea and worms in the ileum if I ever come across it again. It bothers me that I lost my copy of it because it's pretty amazing info. I hope I'm not remembering it incorrectly!
Ah, yes, those darned typos! Thanks for the clarification.
If you ferment any of your feed, turmeric in particular is more beneficial fermented. Fermentation helps make the antioxidants in turmeric more bio available, so you could use less of it. How much less, I'm not sure. I suspect fermented cinnamon and cayenne would be more beneficial as well, though I don't know for sure. Fermentation seems to make just about everything better.