Excellent article! Thanks for sharing. From my research, many long-time breeders have closed flocks and practice line breeding, which is distinct from inbreeding. Here is a quote from the article, though I recommend reading it in it's entirety, it's not long:
[COLOR=0000CD][Now not all chicken lovers are interested in breeding to a standard. They just want to keep some chickens. And that's alright. But if a person has become interested in chickens and wants to set the goal of having a chicken that actually represents the breed and produces offspring that represent the breed, then starting with unrelated parents is not necessarily a good idea. My opinion.[/COLOR]
[COLOR=0000CD]I have said in the past few articles that if you want to get 5 show quality Japanese then you have to set 100 eggs. I know that there are a few breeders out there that chuckle when they read that statement. And rightly so because they are setting 30 eggs and getting 10 show quality birds, and they are doing it year after year after year. How do they do it? An old breeder of Plymouth Rocks by the name of Ralph Sturgeon said it best in the title his little book, " Start Where You Are With What You Have". That's the first step. But the rest of your steps have to be calculated. We are talking about the difference between line breeding and inbreeding. The basic flaw of inbreeding is continually breeding brother to sister, disposing of the parents and taking their offspring and breeding brother to sister. This will eventually end up at the dead end of infertility. (Emphasis mine)[/COLOR]
[COLOR=0000CD]I had a man call last week asking me if I had any good birds to sell. I said I would but good had to be defined. I have what I would call good birds. I am talking about Black Tailed Whites now. I could have sold this man a trio of good birds, but I could not guarantee that they would breed true. Four years ago I got back into Black Tailed Whites by getting breeding stock from four different strains. What I have now are birds that are crossed from three of those strains. I have disposed of one of the strains. I have to set 100 eggs to get 5 show birds. But one of my strains is from a breeder, and he is a breeder, that if he set 30 eggs he gets 10 show birds. The difference here is that I have blended three strains together and he has been breeding the same strain for 50 years. The quality of offspring from his birds is pretty predictable.][/COLOR]
I have been told by a breeder that you could get away with inbreeding (brother to sister) for one generation, but after that you better put mother to son, father to daughter, etc and build a line breeding program. Line breeding closes the gene pool and emphasizes both the good and the bad. When the bad shows up you select away from it year after year. When and if you introduce new stock you will be introducing a whole other gene pool and you have really no idea what is in it until you start raising them up.
Good luck!