[Morian]

раз уж вы так в дисплазию вцепились (кстати, с чего бы? ), то вот вам еще на почитать...

In < 5 generations of selection, the percentage of German Shepherd Dogs with canine hip dysplasia at 12 to 16 months of age decreased from 55 to 24%. Among Labrador Retrievers, the percentage decreased from 30 to 10%.


The most important factor in selecting against a polygenic disorder like hip dysplasia is to seek breadth of pedigree. Most breeders select normal parents with normal grandparents, and expect to produce all normal offspring. This is selection based on depth of pedigree. With polygenic traits, the hip status of breeding dogs’ siblings better represents the range of genes that can be present. With breadth of normalcy in the littermates of breeding dogs, and even of parents of breeding dogs, you are more efficiently selecting for a preponderance of those “normal-hip” genes.



ну и тот же сайт ofa никто не мешает читать...