I agree with Pat. We know of lines that have been clean for yoears and then LS started showing up. Years ago, a local stud had been used for seemed like half of thepuppies produced. I never heard of LS but it probably happened. Long after the stud was dead, a friend used my stud who had him in his 5th gen back to breed with a female that had him in the 6th gen back. There were twin boys born..One had LS; one didn't. I started researching with Dr. Tobias and she wanted blood specs from each puppy but the owners wanted no parts of it. So, my stud was retired and the female was bred only that one time...
The recessive genes that produce our parti colors in US Yorkies are recessive and that is why a parti can be born after several gens have been skipped.
I would try an out-studding for each parent and follow those puppies but would not breed the same 2 together.. LS is too scary for me. There are so many BYBers who have no idea about the genetics of breeding factors and it is causing way too many problems, I am afraid..... |