Well first let me say thank you for your reply. I should have asked specifically about bringing in new blood from a related line and not a separate breed, however, the question was brought up about the New Hampshire which is at least related to the RIR. For the purpose of this scenario though let’s just consider bringing in fresh blood from one RIR line to another line. First of all, why would you want to do this? Cocker Tan Bark states, “Good breeding is only a matter of intelligent selection of brood fowl…” (Tan Bark, Game Chickens and How to Breed Them, 1964, p. 27). Well if every line of chickens were of good size, healthy and fit, there would be no reason to do this. However, if a particular line of chickens have become problematic, could be poor layers, poor hatchability, poor health etc.., what do you do with those chickens?
What if, in addition to some of these other issues, chickens were small? How could you make intelligent selection? What I am suggesting is that there may be a time when it is advantageous to bring in new blood. This is very different from someone wanting to cross up say RIR with frizzle silkies, mess up the gene pool and then abandon the breed after a few years. As a preservationist, what are you preserving with a line of chickens in poor condition and how many years before they would be abandoned as well? Now I have been following several threads and read where lines (of different breeds) suffer from these problems, suggested the need for bringing in new blood, then been told there were no issues and then continued reading about the issues. I have read where some have ‘tried’ different lines and didn’t want the issues and decided to abandon those lines. I’m assuming that the idea, that it is never acceptable to ‘cross’ lines are the reason they are abandoned or never worked with to begin with. What I am asking is, is that always the case? If nobody wanted to work with a particular line of heritage chicken because it had become too problematic, would it really be better to lose that line than attempt to improve it by bringing in new blood?
There is more than one way to bring in new blood. If you end up with one sixteenth new blood, for example, you’ve already been selecting from the offspring who have inherited the ‘legs’ or ‘neck’ from the new blood introduced for several generations right? The purpose of bringing in new blood would be to revive vigor and to introduce some genetic diversity to work with right? I’m just a little skeptical that you never cross anything for any reason is always the best answer, but I’m open to learning, that’s what I’m here for. Thanks again for your input.