You have to breed out the qualities that you do not want and breed in the qualities that you want. For example, if you want more green on your Cayuga's you match them up with Cayuga's that have the appearance you are looking for, but also note that nutrition plays a very big role in a birds appearance as well as understanding the genetetic formulations. If you want the goose neck bred out, you pair up your cayuga with a medium to short necked partner and I would avoid breeding with any cayuga mates that have necks on the longer side. To get larger female Appleyards you pair them up with larger males and ensure their nutrition specifically protein levels are adequate to grow size. It will take many years of dedicated work, breeding and training your eye to pick out the little conformational or color flaws. It may take several generations of breeding to produce a line that no longer carries even just a single trait you wish to breed out. The key to truly good breeding is seperating your emotions enough to know when you have to remove a bird from your breeding line and waiting until they fully mature to choose. So many people just like to pick the cutest duckling of the hatch, but that duckling may very well grow up to have the terrible conformational traits and incorrect coloring. It may be the cutest, sweetest duck around, but if it doesn't have what it takes it simply doesn't have what it takes.
