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Here are my thoughts.
I do use mother to son and keep the two line running so that I can cross back and forth as needed down the road. You end up with two lines that are very close, but slightly different, so there is usually no reason to introduce new blood. I would keep at least five males because you never know what might happen. Predator, illness whatever and if you only have one or two, your breeding program is pretty much done. I typically will give birds to someone I trust...usually a 4Her to raise to further insure that I have access to more males with the same bloodlines. I have had some major kills by predators (19 to 25 birds in one night). That is not much of a problem now because I finally got smart and I now have an electric fence. Even with that, a mink can find a way in and they kill everything in a pen. In addition.....my birds don't get sick...but they could and then again you would be wiped out. I don't keep all of the same breed in one location on my property for all those reasons.
What I am saying is 1 to 3 males can go very quickly and I don't want to lose years of work because I didn't have an insurance plan.
I usually add this disclaimer: This is just how I do it and it may not work for others.
Walt