yes, Hans, I expect there ARE pages of references in the book, given the subject. I asked ONLY for the citation for the rate of HD in the breed that you said you got from Lanting's book. I'd remember if I read that rate of HD in any study, so I want to access the source of that finding and read the original study for myself. No matter, if the source of that data isn't identified, I can live with that, too.

Of 3036 registred dogs in 2005 and 58% x-rayed, about 28% had HD in the swedish population, meaning grade C-E in the FCI system. Since 1975 that number have been pretty consistent, around 25% plus/minus a few procent. In germany it was 35% in x-rayed dogs between 1999-2003, can read more about that in this study,
http://elib.tiho-hannover.de/dissertations/januttav_ss05.pdf

Hip dysplasia is about 30 % or lower in GSD's and much higher in other breeds using Riser's method.


Pol J Vet Sci. 2008;11(2):139-42.

Canine hip dysplasia of selected breeds--results obtained by two Polish clinics based on radiological examination conducted in 1997-2006.

Aleksiewicz R, Budzińska Z, Nowicki M, Adamiak Z, Lisiecka B.

Source

Society of Silesian Veterinary Policlinic, Chorzów, Poland. provet1@poczta.onet.pl

Abstract

Canine Hip Dysplasia (CHD) is still a significant health problem among dogs of so called predisposed breeds where this disease is revealed even among 30% individuals of the whole population. The present results were obtained by two clinics and deal with CHD occurrence among the most frequently and predisposed breeds in Olsztyn and Siemianowice Slaskie/Upper Silesia, Poland. Radiographs of hip joints were described using Riser's method. Altogether 2279 dog were examined including 2113 animals which were analysed. The German Shepherd Dog was the prevalent breed found in both clinics, but CHD was not common in this breed. In the Olsztyn Clinic, the most numerous group affected by CHD was Neapolitan Mastiff (60%), while in the Siemianowice Slaskie Clinic, dysplasia dominated in Bernese Mountain Dog (46%).

And see this second study...

J Am Vet Med Assoc. 1985 Oct 15;187(8):805-9.

Trends in hip dysplasia control: analysis of radiographs submitted to the Orthopedic Foundation for Animals, 1974 to 1984.

Corley EA, Hogan PM.

Abstract

From 1974 through 1984, the Orthopedic Foundation for Animals evaluated 143,218 radiographic submissions representing 151 breeds of dogs. All breeds from which there were 35 or more evaluations had some frequency of dysplasia. Seventy breeds, each with over 100 submissions, were tabulated and ranked according to frequency of hip dysplasia. Frequency of dysplasia varied from 0.6% in the Borzoi to 46.9% in the Saint Bernard. These data were compared with data obtained earlier (1966 to 1973) on evaluations in 38 breeds for changes in frequency. There was significant (P less than 0.05) reduction in frequency of dysplasia in 27 breeds, a significant (P less than 0.05) increase in frequency in only 1 breed (GermanShorthaired Pointer), and no significant change in frequency in 10 breeds. The median significant decrease was 22.4%, and the range was from 3.1% in the Chesapeake Bay Retriever to 48.7% in the Keeshond. The reduction in frequency of hip dysplasia demonstrated the value of a control program. There were 5 breeds with a significant (P less than 0.05) decrease in frequency of dysplasia that had over 5,000 evaluations from 1974 to 1984. The decreases in frequency were independent of changes in American Kennel Club registrations for these breeds (a dramatic decline in registrations for the German Shepherd Dog and Old English Sheepdog, and a dramatic increase for the Rottweiler, Golden Retriever, and Labrador Retriever). Frequency regressed linearly in the German Shepherd Dog and Old English Sheepdog, but regressed nonlinearly in the other 3 breeds. The percentage reduction in frequency from the base frequency (1966 to 1973) for these breeds was 17.5% for the German Shepherd Dog, 23.1% for the Old English Sheepdog, 9.1% for the Rottweiler, 10.1% for the Golden Retriever, and 6.8% for the Labrador Retriever.

I guess that 22% that I referenced seems pretty good when facts are presented....but that's what I get for going back and forth with people of limited knowledge of what they argue.

Gustav, speaking for myself, I wasn't questioning the origin of the 20% to 30%--I wanted to know where the "40% to 60%, worldwide" statistic came from.

Hexe, I'm not referring to anyone specifically, just general comments that intimated that 22% was a high negative for a breeder.....but I'm too lazy to track down facts, but I base my premises and actions on facts. Eventually many will see the light factually, but until it is presented....all I can do is SMH. TC

Thanks Prager

Gustav lay your credentials out so we will all know the truth.

still here observing the crowd....hey JBasler...credentials...internet...oxymoron I'd say...how anyone can be sure who is behind the curtain is beyond me....anyway....Gustav, leave while the leavins good....I'm ducking over here>>>>

J Basler....I'm not interested in complying with your request, your focus should be on the statistics of HD and not me. Find a novice to play that game with....when you find out the complete facts on HD, and then compare that to my posts...then you have my credibility. That's all the "cred" you need from me. The issue is HD.....the more you know the more you can assess me through my posts.
@Judron.....I think you may be right.