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This is a genetic thing I actually am stumped on. I think in the Chicken Calculator is says you get 50/50 tailed and rumpless, which I think would seem a fair thing to say, because this is how it panned out -
Araucana A x tailed bird = 2 rumpless, 3 tailed
Araucana B x tailed bird = 3 rumpless
Araucana C x tailed bird = 2 rumpless, 4 tailed
However, the thing is, a bunch of birds with tailed/non-tailed yet have either tails or no tails doesn't make sense. That's like saying a bunch of birds with one blue allele came out splash OR blue, or black OR blue. . . Just not possible. Now, there are some Araucanas out there with some floating, nasty tailed genes in them that throw tailed Araucanas, but I've yet to have that issue, so I don't think that is a factor in my birds. But, only time will tell. I haven't bred and hatched enough Araucanas to say for sure yet.
I just tried it on the calculator and it says:
pure rumpless x tailed = 100% impure rumpless.
impure rumpless x tailed = 50% tailed 50% impure rumpless.
I hate to think of it this way but unless the calculator is wrong then the Araucanas in breeding pen A and C were impure rumpless(Rp). On the other hand, heres what Dr. Albert McGraw wrote in this article
http://www.feathersite.com/Poultry/CGP/Rump/Manx.html :
Through the long time frame that I have been affiliated with this breed, I have experimented with crossing a Manx Rumpie female with a conventional male and found, and not particularly to my dismay, I might add, that the offspring is not worthy of their feed. Such a mating produced a high percent of semi-rumpless birds; also, many of the chicks had the conventional tail, while something like 20-25% were completely rumpless. When using a female conventional bird with a Manx Rumpie male, all percentages resulting from the conventional male and the Manx Rumpie female, closely paralleled.