Agree with Big Medicine. I can't really say how many pullets/hens I've waiting on hoping the tail will stand up some. I think I could have waited a lifetime and they still wouldn't stand up. Best bet, probably try to breed the best upright tailed male to the best female tail you've got. Last year I think I hatched out about 40, only two of the girls have the tail set that I like. They were both from the same breeding and are both at the bottom of the pecking order, so whether they are dominant or not doesn't have anything to do with it (I don't think). I'm pretty sure it is a genetic thing. You can bet I'll be breeding those girls this year though...........