Quote:
Originally Posted by gemy  Dd = carrier. If mated with a normal DD dog, half of the progeny will be carriers, and half will be normal. If mated with another carrier, 1/4 of the progeny will be normal (DD), 1/2 of the progeny will be carriers (Dd), and 1/4 of the progeny will be blue (dd). In a breeding program, all carriers should be neutered or spayed.
Now if you read the genetic information on that link I posted you will see that your breeding pair at least both of the two would have had to be carriers.
So if I understand your breeding records correctly your bitch had had four litters before all "normal" ie no blue borns, so she must be a Dd that mated with DD's until this last litter where in she was bred by a carrier of that gene. For if the sire was DD as well, they simply could not have a blue born pup....
So if I am doing the genetic math correctly, all litter members of your bitch especially if there are any out there breeding, and the breeders of your bitch and sire need to be notified that she carries the gene, and therefore your bitches parents must both be carriers. So that spans a whole lot of notifications. And I am aware you have sold all previous pups on a spay and neuter contract, and hopefully have some method to see if this neutering actually happened. |
Just for the sake of clarification.
Unless the dam had a blue born full sibling, both of her parent may not have been carriers. BUT at least ONE of her parents is a carrier, that's for sure, because she got the gene from somewhere.