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Not using vulture hocked birds for breeders is a very important first step. But it is not as simple as that, being a recessive trait, and having had VH show up in a chick means at least one hen, and the male in the breeding pen each carried a copy. So it's likely half of the non VH chicks out of this same male will carry a copy, (as well as any other chicks from any hen(s) that carried it), and will pass a copy to half their young. Which will remain hidden until it meets up with a copy coming from the other parent.
The group of SLB chicks that had the one VH chick were from hatched eggs that I purchased from someone here on BYC. I am only keeping 3 pullets of that group to add to my SLB roosters and hens from Dan's stock. I am hoping that by combining these and having roosters from different stock will reduce the risk of vulture hocks. If I find any evidence of VH in this Spring's hatchings, then I have a big problem. Correct approach?
To the best of my knowledge, all silver laced Brahmas in the U.S., including Dan's, originated from my stock, as well as his blue laced golds/reds. He has blended them with his own buff laced project birds since then.
Have you hatched any chicks out of the birds from Dan ? If so, any sign of VH?
If you have the room and multiple males, I believe I would keep the females seperate. Because you know the newcomers at least are suspects for potentally carrying a hidden single copy.
That's the difficult thing about breeding out a recessive like VH, single carriers look perfectly normal. Another option would be to test mate to a full blown VH. Any bird who produces any VH chicks out of this mating(should be 50% so won't require alot of chicks to tell) is carrying a single hidden copy and should not be used as a breeder.
If I had to do it over again, and had any inclination of such issues popping back up, I would have surely kept my birds here, till I had it worked out. Have not had any such problems with my blue laced red project birds, and have not mixed these lines for that very reason.