You can cross breed pretty much anything chicken. I have thus far hatched out 6 "cobrights" from my friend's flock. They are half bantam birchen cochin & half sebright. They're funny looking but *very* sweet birds and with really strong/tough constitutions. We hatched out the first 2 five weeks ago & hatched out 4 more just yesterday.
Sometimes it's kinda cool if you have a mixed flock or know someone with a mixed flock, and you get all kinds of nifty mixed breed chickens that are really sweet and have good hybrid vigor and lay all kinds of nifty-colored eggs. I'm always hatching out "mystery chicks" ... or as I tell people when I sell them, "Designer" mixed breed chicks. LOL.
anything you breed with a polish more then likely will get a funky looking tophat..not as full as reg. polish. i have alot of cross breds - mutts. some are just beautiful in colors or markings..others look just like a parent. i had bearded polish, now cross bred with cochins & ??? have bearded cochins,3 generations . neat looking. as for eggs..most crossbred lay regular,maybe a medium size egg..but polish are not famous for everyday laying, so you might end up with fewer eggs ??
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What do you mean by "better" ? If everyone only did crossbreeding then there wouldnt be any breeds to cross. Inbreeding does not mean deformed chicks, inbreeding can fix good traits into a line as well as fixing undesirable traits. The key is selection.
All my older chickens are pure breeds but the 16 barnyard mixes I hatched recently are giving me much joy. They are to much fun trying to work out just what they will look like when grown. I even have one or two starting to grow crests. I can't wait to see what they end up looking like.