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You used to be able to buy things called Poultry Saddles. These fitted over the hens back to protect their feathers and body.Once the feathers go the spurs/claws on the male bird can rip the hens requiring a trip to the vets.Have a look on poultry supply web sites like Ascott Smallholding Supplies or in the back of Pratical Poulty Magazine or even their forum.HTHJerry