- Jul 24, 2013
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X2 on Wyandottes7's advice, though I've never heard of worms causing yolk color changes.
The worms themselves don't exactly cause the yolk color to be light. However, a bird with a heavy worm infestation will not be as healthy. They will put less energy into the egg, and the yolk color may lighten. Just as a bird with a worm infestation will often appear pale.
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