If you are talking about single laced birds you can cross them to Buff Laced Polish and breed out the gold diluters.  If you are talking about the Jubilee pattern of Cornish (white double laced reds)  You can cross them to buff laced or gold laced and it will not matter because you will have to transfer the recessive wheaten or eb allele from the double laced pattern into the standard sized Polish.

 

Al Westling was kind enough to send me some blood samples of some of his birds.  His Polish have the birchin E locus allele like we suspected, but he has a low frequency of some weird E locus allele.  That doesn't type as eb, eWh, E or ER.  I haven't done the Fayoumi Birchin test on it, but I didn't figure he would have the Fayoumi allele in his birds.  So far it looks e+, but I may sequence it to see if it is some unique mutant.  From the type of his birds it probably has the same affect as the birchin allele, but does it some other way.

 

If you are going to create the pyle pattern you will need to cross in the e+ E locus allele.  You can use Buff laced because they are sex-linked gold with dominant white.  The buffs may have gold diluters that you don't want, but crest is only 10 centiMorgans from dominant white and you will have to breed for the recombinants if you don't use Buff laced birds.  This just means that crest and dominant white are close together on the same chromosome and 90% of the time they go together.

 

There are a lot of genes that you have to get rid of to make the pyle pattern, so it isn't going to be easy.  When I tried to create a BBred Polish I had trouble getting rid of the Db and keeping the large crest.  Crest isn't linked to Db, but it may be that one of the modifiers that are needed for a large crest is.  You may be able to get a psuedo pyle pattern by keeping the birchin allele and you may be able to keep Db and still get the red shoulders, hackle and saddle, but the females will not look like pyle females.

 

Tollbunt Large Fowl