Of my three pairing in 2012, two pairs produced high tails in all the offspring I grew out, and one pairing produced low tails in all of the offspring I grow out. This spring I only grow out a sing pair from my flock. They were from a cockerel I sourced from another breeder. Both the pullet and cockerel grown out from that pair had low tail angles (and I hatch 20 more from that cockerel this month to grow out). I also grow out four cockerels and four pullets from hatching eggs from the other breeder and as a group that line also produced lower tail angle. I need a mentor that has been working on these type of improvements for 10+ years to tell me what to look for in pairing and mating to improve tail angles, but my observations from what I have hatched so far is that both the cock and the hen contribute to tail angles in the offspring, it is NOT sex linked, and that either a low tail angle hen, or a low tail angles cock paired with a high tailed mate will produce lower tail angles that the higher of the two parent (some as good as the lower of the two parents, but most somewhere in the middle). I am seeing cockerels and pullets from the same pairing with the same tendencies to tail angles, so in my grow out groups this is not a cockerel problem or a hen problems, but rather something that is equal in both genders.