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Quote:
Originally Posted by elf
Elevage qui a, comme les autres, pour commencer choisi des chiens venant d'autres élevages. (Et une proportion plus faible de "?" (comme par "hasard"...))
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We spoke about it with Hartl and also with representans from other countries... So far because of the small amout of HD-results it is not possible to say about "lines with dysplasia" and "HD-free lines". But the fact is there are lines which have much lower number of HD dogs than some others...
There are different reasons - as always by dysplasia
You have genetics and other "external" reasons.
From my observations I must say you can find much bigger number of dysplatic dogs by lines which are called as "heavy" (it is one of the "external" reasons but base also on genetics of course). When you look on small wolves you can see they are sometimes VERY skinny. And wolves "even if some of them are later pretty huge animals) are almost free from HD. The same is with CzW - when you have two litters - one of long legged, skinny puppies, and second of heavy "teddy bears" it is VERY probably the skinny puppies will have much better HD results than the puppies from "heavy" litter. It can be described and "external" because it has a lot to do with feeding - if you pay attention to the weigh of puppies thay can have much better results than the fat puppies...
Second is genetics - you listed dogs from my kennel so lets make it as example. The good results base on the genetics and probability. Look on the pedigrees - in the most cases you have litters which have in 2-3 generations almost only of HD-A dogs. If you cross two dogs with "heathly" hips by the ancestors (not only mother, fahter and the grandparents but also by other generatrions) you
can not be SURE the puppies will be healthy, but the
probability to have healthy puppies is MUCH higher than by litters where you have only bad and average results... It really works...
This exactly use the Czech and Slovakian breeders - sometimes thay use the dogs with HD-C when the blood is interesting. If you mate HD-C dog with a dog with very "healthy" pedigree sometimes you reach much better results than when you mate two dogs HD-A or HD-A x HD-B but with pedigrees full of not so good results...
What I'm writing about is the "HD-Zuchtwert" which is counted by German Shepherd Dogs. We are not able to count them because CzW do not have so many offsprings as GSD but the same system is working here...