I've never raised Cochins, so I may not be of much help. You don't say what colors you have; but if you have white or buff, you will need to limit their exposure to the sun. Too much sun will cause the white to become yellow, and it will cause the buff to fade.

In order to keep their foot feathering looking good, I suggest you put them on a thick layer of wood shavings, and only let them out during the late afternoon. Maybe some members who raise Cochins will give you more and/or better advice.
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Rhea Dean