Wynette, I think you remember I told you I only brought in new Blood for my Buff Brahma Bantams one time in over 30 years of working with them. The way this works you must have on hand a lot of different lines to be able to use them together.Don, this is surprising to me, as you've always said the same thing - that it's best to not bring in outside lines, breed the line you have, linebreeding is the best way to bring out the positives in your flock, etc. I thought you of all would appreciate the post, so it confuses me that you're bothered by it.
Ben has been breeding fowl for longer than I have been on the planet, and Marans I believe for 8+ years. Longer than most any of us. So, I would think he probably knows what he's doing...who knows? I don't personally know the man - have met him, but I do not know how many fowl he breeds a year and what his reasoning is behind what and how he does it. I was only providing some insight into ONE person's thoughts on breeding. Doens't mean it's right, doens't mean it's wrong. It's just one person's opinion.
What I have done, personally, is that I have duplicated my flock with another breeder several states away. This is someone I have faith in; we made decisions on our flocks together so that we always know what the other's flock is looking like, and we help each other with birds on occasion to help issues along. Then, every 4-5 years, we will swap a good cockerel. This way, we have the same line going, but this is a way to infuse "new blood" for vigor. That works for me - for us - might not work for you or someone else. Again, it's just food for thought.
What you are doing is a good method as long as the two yards are bred with the same goal in mind. I also think it is a good idea to just bring in a male bird instaed of a female. I have always tried to keep my own female going and have always kept a lot of extra females. Most know I do not like to use Pullets unless it is absolutely necessary. I want them to survive at least one winter.