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So what you are saying then is that when chickens start eating feathers we should up there Calcium (Ca) intake?
If so, how are you going to do that to chicks and roosters that are not supposed to have added Calcium in there diet do to health problems?
I have done the research, and I have found much the same information, feed is lacking in Protein, feed is lacking in Animal based Protein, Mites or Lice, Boredom and Mineral imbalance.
Here is a quote from Dr Marinus van Krimpen of Wageningen University and if you would like more information I'm sure you can "Google".
"Severe feather pecking has been reported in birds that were fed a too low mineral level in the diet, a too low protein level or a too low amino acid level (methionine, arginine).
There appears to be somewhat more more feather pecking with diets containing only vegetable proteins compared to those fed some protein of animal origin.
Feather pecking is also more associated with diets that were restricted, coarsely ground or fed as pellets."
Dr Marinus van Krimpen of Wageningen University
Chris