Hen losing feathers on red belly, feathers black at base

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Thank you very much!

 

[Sonoran Silkies]

Oily seeds such as sunflower, safflower & flax are helpful as they grow new feathers. Some mites are microscopic and burrow into the skin, so yes, you should treat her for them.

Most birds don't lay during a molt, or lay very infrequently. Many birds won't lay during extreme heat.