Yes Redcap, it was research on behavioral effects of I dominant white (PMEL17 locus mutation). I haven't read the research though, only skimmed. Was wondering though if they needed to be E or ER eumelanin based, & I/I homozygous, as Lohmann Browns & Isa Browns (I/i+ dominant white red columbian) were known to be more cannibalistic /feather peckers when first imported to Australia.

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I wonder Kaalnek if someone had used White Leghorns to develop that line of White Naked Necks? Seems a good place to search for B^Sd is commercial White Leghorns, going by recent research.