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increases fertility, especially in breeds such as cochins etc with a lot of feathers, keeps them cooler in the summer. and keeps droppings out of the feathers.. about it
I read in another post that you should trim the roo below the vent and trim the hen above the vent to help fertility. I'm scared to trim mine, I'm afraid I'll cut too short or something.
~Rebecca
Even if you think you did a sloppy job, no worries! When your chooks molt they'll lose the stumpy feathers and grow new ones (which you'll have to trim, of course).