Breeding is the most important area of keeping racing pigeons in my opinion. With good judgement and some luck, you will get your champions!
I am no eyesign expert - but good depth of colour and detail is a must for me - What I refer to as Red/Grey eyes to Orange/Yellow where possible.
As with Eyesign, I am no expert, just know what I like. For me the distance birds need a slender wing with the last flights narrow and supple to be able to flex over the many hours of flight expected
The feathering of the birds has to be tight to the body and look almost seamless, but most important, be silky soft, something the Dordins are known for.
Body type in the Dordins find the cocks can be big and bold, so its important to try and keep the hens on the small side to counter this, so big to small. Another important feature of my birds is that they must have a strong back, I cannot abide a weak back where the tail tips up.
I hear many say don't breed off old stock! My best birds are 10yrs old and over. so what I do, is pair them to younger partners. I try not to breed from the yearlings.
If possible I will line breed my Dordins, but will happily bring in a crossed Dordin line to renew the blood when I think it suits the loft.