Brown Red already exists in the bantam cochins as well as lemon blue so you could search out breeders to get some from. I am not sure how you would go about creating them from scratch, sorry. Try Tom Roebuck, he may be able to help. (Google search him and his site should come up).
There are a few Brown Red breeders working with the color. I had them for a couple years but gave them to a fellow breeder and he has continued breeding them. The bird in the photo on the link that Coopa Cabana recommended is not a Lemon Blue. Looks more like a Buff X Blue Cross or vice versa. That is not how you produce lemon Blue, and Buff X Black is not how you produce Brown Red. Both are very distinct color patterns and you can find a description of both in the APA SOP and ABA Bantam Standard. You can use Brown Reds to produce Lemon Blues. Most often recommended method is to use a Brown Red male over a splash female. You will most likely lose some of the saddle and hackle markings in the offspring but you could choose for the best marked bird that you get with good blue ground color (keeping type at the forefront of course), and then breed them together. I would also take a lighter ground colored bird from the Brown Red X Splash and breed it back to Brown Red. You'll bring back in the color markings with this match up quicker, and you will get about 50% blue ground colored "Lemon Blue" birds. The remainder will look more or less Brown Red. If you would like some contact info PM me. I can tell you that they will not ship eggs. You'd have to go with adult birds in the fall if they have extras.
...Both are very distinct color patterns and you can find a description of both in the APA SOP and ABA Bantam Standard. You can use Brown Reds to produce Lemon Blues....
Thank you! I don't find a description of lemon blue, but would it be the same as brown red except with blue replacing the black?
From the description, I'm almost sure my Cochin boy IS lemon blue. Do you have pictures or can you point me to where I could find them?
That's kinda exciting!
You would need to make the brown red first. I would think you would need to cross Silver Birchen hens with a Gold Columbian roo ( Buff Columbian if you can find one or maybe just Buff or Golden laced, you just need him to replace the silver with gold in the Silver Birchens. Once you have Gold Birchen, that is the same as brown red. I think if you cross a buff columbian male with a silver birchin female, you will get some brown red females as f1s, then you would need to keep breeding those Brown Red hens back to the Silvers but learn the genetics on crossing silver and gold first so you don't end up loosing the gold.