This thread goes fast. Don't pay attention a couple of days and there pages and pages. I didn't see where anyone had answered Pozees question.
Spiral Breeding:
Maintain three lines (or you could even have 5 lines) - A, B, C - for season one mate them to females of their own line. Daughters of season one are added as breeders to the line that produced them (they stay with their mothers). Sons are compared to their fathers for quality. In season 2 mate the C line male to the B line females, mate the B line male to the A line females, mate the A line male to the C line females - rotating them. Females from season 2 are added to the line that produced them along side their mothers. The best son of the C line male mated to the B line females is kept and mated to the B line females; same for the other matings; the old cocks are retired.
Once the system is up and running, males are used twice, then retired in preference to a son. Males rotate one line over every other year. This gives you a year of outcross and a year of line breeding. The simple name for this system is "Spiral Breeding". Well known the world over, very old system.
Rolling Matings (from BYP magazine):
Rolling matings require at least two pens for each breed or variety but a minimum of record keeping.
Rolling matings select the best cockerels and pullets from each season and breed them back to the best breeders of the previous season. Cockerels are bred to hens, cocks are bred to pullets.
Rolling matings can improve the stock and maintain genetic diversity with a small flock, but larger flocks provide more opportunities to select the desired characteristics.
http://www.backyardpoultrymag.com/issues/1/1-2/Craig_Russell.html
In regard to strains and lines, I like how Don Schrider put it when explaining it to the Buckeye club (ABPC):
IMHO, it is important to know the origin of your birds as much as possible (for reasons of crossing, etc.). Also, I am always in favor of knowing more, having more knowledge, etc (why not?). I disagree that it is all simply about making a buck. I know I don't make any money but spend enough each month for a mortgage payment. I also know that is not always possible to get the information about the origin of your birds, but even if the birds are not up to SOP, knowing their origins, you might can know the genetics can still be there.
For instance, I say that I have the McCary Line of Urch Strain Buckeyes X ALBC Strain. I happen to know what lines and strains went into the creation of the ALBC Strain. I also know that Urch has had his Buckeyes since about 1958 which he acquired at that time from Howard Tallman in Florida. I am told the Urch strain can be traced back to the creator of the breed. Some hatcheries have never divulged the origin of their Buckeyes so that knowledge is lost.