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That can certainly get you red sexlinks but will NOT produce ISA Browns... it's only an ISA Brown if it had ISA-line parents (they keep special breeding stock for the female and male parents of the cross that produces the ISA Browns, similar to what's done for cornishX broilers).
Good...
I have a page on them at https://www.backyardchickens.com/web/viewblog.php?id=1642-ISA_Browns
Yes, they lay well, although any advantage over other good sexlink types is probably negligable except in controlled battery-farm conditions.
They are a sexlink, but from very *particular* lines that...