Lior: As far as I know, the Geonim don’t bring it down. It’s brought down in Rishonim as a Minhag from the time of the Geonim and many Rishonim had major problems with it. Lulei D’mistifina, I would say that Kim’at Kullam would hold that the Arizal’s Hiddur of using a white chicken is an absolute Issur D’Oraisa.
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