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And
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Maybe you should host a few of us, so that we can ride the horses to the chicken coop and evaluate first hand what is going on.
Then when we enjoy our breakfast of fresh scrambled eggs and homemade gluten free bread, we could discuss what might be causing the feather loss.
Then over hot chocolate, in front of the warm fire in the fireplace, we could share our thoughts with you.
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What do you feed the girls?
What are the dimensions of their coop? Their run?
Would you post pictures of the coop, the run, and the backsides/bare rumps of the chickens?