To be kept white, the Silkies must have clean pens, not kept on dirty floors. And they should never be outside when the ground is wet, snowy, or muddy. So keep them dry, keep them on clean shavings or other clean dry bedding, and keep them from getting muddy feathered feet, which will track dirt into their pen. Let them roost on a very low roost that has a box to catch droppings, so they cannot walk in them.
Silkies stay clean and white, if their coop is clean.
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