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Rereading this ..... what David said ..... Select the Delawares and the Silver Columbian pullets. What is "Silver Columbian?"
Do I have this right?
Step one: Mate BR male x NH female
Step two: Mate those F1s together
Step three: Mate the Delaware roos x Silver Columbian pullets
OK ..... find some great New Hampshire pullets or hens for me, and I will get this started, and YOU ALL can raise the chicks!
The way I produced my silver columbian rhode island (a work in progress) was similar to the regimen proposed by David. I used rhode island red females and a black sex linked male in my first cross.
This only works if the barred rock carries silver and not gold. If the rock carries gold the you will never get the silver birds to segregate from the F1 cross. You do not know if the rock carries columbian or not- they may even carry the pattern gene- you have to do the crosses and find out. I hatched over 60 chicks to get two silver columbian males and no females. Any females that you produce will most likely show some red on their backs
My f4 female birds still carry some autosomal red- which is a pain to breed out of the female birds. The males tend to be smutty on the breast. I am going to introduce the dark brown gene and I am sure it will clean up the smut. I will also have to introduce melanotic to insure the offspring have some black in the hackles.
I am doing this because I am trying to add to my body of knowledge concerning genes in chickens. The females produced will work for a red sex linked cross-say a RIR or a New Hamp X the silver columbian.
I would not suggest that a person try to produce a delaware from scratch.
Tim