Hip Dysplasia study done by the SV??
I have been researching hip dysplasia as it is a fear of mine in getting a future puppy, and ran across this quote from leerburg:
"The SV in Germany (the German Shepherd Dog Club of Germany) has proven that genetics is only responsible for about 25% of the bad hips in dogs. This means that 70% to 75% of the bad hips are caused by environmental issues."
Is this true? Does anybody know of this study, or have a link to it? I have never heard this before and am curious.
I think I know what you mean.
The study is in German, if you don't know German just tell me and I'll try to translate the main points:
I definitely cant speak german, if you could translate that would be great!
Thanks so much!
Something to think about - if I were looking at buying a GSD puppy, HD would be lower on the list of concerns - and up more would be elbows and spine, and I would google German Shepherds common disorders disease inherited disorders, etc, to see what else you need to be looking for to ask about (GI, skin, heart, eyes, neuro, etc).
I have been reading pretty much everything I can about GSDs. My current dog has HD, so I guess that is why I am so cautious about it.
This statistic struck me as odd as I had always thought that HD was mainly genetic.
even E A Corley one of the founding members of OFA said in an article in a magazine from the 1980's that the best diligent x raying and breeding practices can do is to change the ratio of worst results. There is a basic 30% which remains static , unmoveable and so is part of the "norm" .
I think that overall the number of GSD with "worst" hips has diminished , but not the overall number of GSD with hip dysplasia .
Another factor is that North America seems to be marching to a different drummer as its range of normalcy is more narrow than the rest of the world , including SV , Czech , UK, Sweden / Denmark etc.
An NZ would most likely not clear OFA . Some NZ have been hip improvers , Mutz Pelztierfarm being one such dog , as in the Wooton and Willis books . Had he been born here , he may have been overlooked as a sire - yet , thankfully, he was used, improved hips, improved working temperament and conformation.
hips are only one thing to look at.
Better to examine littermates , and pedigree depth.
Ok, so I'll just try to translate the most important parts. Unfortunately I don't really know the specific vocabulary in English so I hope you understand what I mean... :p
* He states that many people believe "genetic" means genetics or genes exclusively would predetermine the illness.
--> That's definitely not true because many different factors influence the building/growing of a good and healthy hip.
* The different stimuli during growth have an effect on the body.
--> THIS it what makes the difference for each dog: The reaction of the body differs depending on the genes each dog has! Some dogs respond to
- early training workload
- food whose energy level is too high
- fast growth
- deficits in mineral supply
with deformed joints, others don't.
* Of course a bad environment can effect HD, and a good environment can effect good joints. But deducing that it has nothing to do with genes is wrong!
* He sees HD as indicator if the risk is reduced or intensified in the genes.
--> Breeding against HD (to him) means to breed dogs that don't react with bad joints even if they're growing up under unfavorable conditions.
* The last statistical analyses for the German Shepherd in Germany show that hereditary reasons account for under 20%.
The whole diagram thing shows the progeny of different HD breedings (dam good hips, sire bad hips; dam almost good hips, sire good hips and so on)
The results were:
1) The higher the HD level/grade/rate (don't know the right term...:blush:) of the sire, the more HD cases in the progeny.
2) The higher the HD level/grade/rate of the dam (with the same HD level of the sire), the higher the level in the progeny.
3) The HD risk of sire and dam can be added. --> Sire with good hips (=1) bred with dam with bad hips (=3) has the same HD risk as sire and dam with almost good hips (=2).
4) The dogs with almost good hips are unfavorable when it comes to HD risk and heredity although their hips are basically ok.
I hope you understand some of it. It's really hard to translate for me because of all the technical terms...
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