It's kind of amazing how many PM's I'm getting from folks who seem to appreciate these little chats. We do what we can and hope it strikes some thoughts, hopes and aspirations.
I've never been a believer is just throwing stuff at the wall and hoping things will stick. Intentionality is a word I stress with those I work with. I see no point in putting lots of stuff into the breeding pens in the vain hope that something really nice will come of it. I would rather hatch off a year's worth of chicks from just two or three birds and know what I'm doing than do a whole bunch of random nonsense that merely produces a bunch of stuff I gotta cull anyhow. You can easily hatch 50 chicks from a good trio.
When we built that Barred Rock line that so many folks are enjoying, here on BYC and elsewhere, we built the whole thing off a great cockbird and two pretty good hens. We just hatched and hatched and hatched. The second year, we followed the plan I described above. The third year, we then had three generations and could make matings from "aunts" and "uncles" as well as line breed through the sire/daughter and K/dam matchups that are typical.
5 miles away from our breeding farm was a friend who was running a dead-on parallel, same blood line, program. After a few years, using a "2nd cousin, twice removed" if need be was done, especially to fine a good cockerel.
I know it's been said many times, and was recently asked of me. Do you avoid sibling matings? As a general rule, I have. I see no point in it if there are other, better matings to be made.
A few years back, we caught a bit of DNA lightening in a bottle with a really good female. Thru breeding this way, Anne, Jill, and three or four other folks, as well as myself, have virtually "cloned" that good hen into dozens and dozens of great looking female Barred Rocks that all look like cookie cutter versions of her. There's a great grand-daughter in my barn pen right now that is one of those. A really solid female line. A male line is tougher with the Barred variety, it seems to me, in my experience.
If I wanted BR males to make a show string, I might would go talk to Jamie or Tom Wheeler or someone for some guidance and a few young birds, I think.