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A flock which includes cockerels should simply be fed a flock raiser or grower ration. The hens can be supplemented with oyster shell. This is because the excess calcium in layer feed can have severe impacts on the kidneys of cockerels, as they are forced to filter out the large amounts of...

I have seen this in a select few cockerels, of varying breeds and environments but always having a pea or walnut style comb. Specifically I have only seen it in those fed a layer feed, which cocks should not be fed. My thoughts are that it's the bird excreting calcium through the comb.