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• W37366012 abstract "This thesis describes the long-term follow up of a birth cohort of boxer dogs to study disease incidence, mortality, as well as genetic and environmental risk factors in a purebred dog population in The Netherlands. During the last decades, both the number of genetic disorders and the disease rate of these disorders seemed to increase. Therefore, special attention was given to presumed genetic disorders. Heritability in this thesis was estimated using a proportional hazard model based on the Weibull distribution as implemented in the Survival Kit software. Parametric survival models were developed to identify the influence of potential risk factors. Risk factors included individual data and litter data. Between November 1999 and March 2004 a total of 1863 boxer dogs from 388 litters, all born between January 1994 and February 1995 were monitored. Data was collected by interviewing the dog-owners through self-completion (mail) questionnaires, which were sent every 6 months. At the end of the study 674 boxer dogs had survived up to that point, 530 dogs had died (including euthanasia). Survival analyses, accounting for loss to follow up, resulted in a mortality rate of 45% of the cohort of boxer dogs. The highest disease incidence in this boxer dog population was attributable to hind limb lameness of which cranial cruciate ligament rupture (22%) and canine hip dysplasia (8.5%) were most frequently diagnosed. When the box-floor was covered with slippery material, the risk of cCHD increased 1.6 times, and the risk of cCHD doubled in litters with high preweaning mortality. Castration, =6 months prior to cCHD diagnosis, increased the risk of cCHD 1.5 times. The general risk of boxer dogs developing cCHD and CCL rupture after 5 years of age was 1.8 and 2.4 times higher than before the age of 5, respectively. The effective heritability of cCHD was 11% and of CCL rupture was 16%. We described tumor and cancer incidence. Classification of skin tumors showed a high incidence of mesenchymal tumors (88%). The risk rate of developing mesenchymal tumors after 5 years of age was 43.6 times higher than before the age of 5. We studied whether or not the segregation of white spotting in the boxer dogs follows a Mendelian inheritance pattern. Because the flashy phenotype seems to be an intermediate between the two homozygotes, white spotting in the Dutch boxer dog is apparently due to a single gene effect, with incomplete dominance. We have evaluated candidate-genes c-KIT (KIT) and EDNRB for segregation with white spotting phenotype, but found that segregation of the white spotting pattern did not coincide with segregation of these polymorphic markers. Our group developed a genetic counseling program for boxer dog-breeders in the Netherlands. The goal of the study was to evaluate the use of our genetic counseling program by Dutch breeders of boxer dogs. Although it was the first time breeders could make use of genetic counseling, 32% of the breeders indicated that the genetic counseling played a major role in their sire selection. The ideal breeding schemes would select breeding animals with the best possible estimated breeding value (EBV) score while constraining their average coancestry to a predefined value. Therefore application of EBVs should be added to the standard criteria for selection decisions. Genetic counseling programs that provide an overall EBV index could facilitate the task of dog breeders to select simultaneously for several characteristics. We calculated the EBV of the 10 best and 10 worst sires to predict the risk of cCHD, CCL rupture, life expectancy and mesenchymal skin tumors, respectively, in the progeny of these sires. The results illustrated that breeding programs can be improved by the introduction of EBVs, which enable the breeder to identify the best male breeding dogs In the future, veterinarians will be able to offer an increasing number of DNA-tests to their clients. Because this DNA-testing is not sufficiently available yet, the elimination of genetic disease is hampered. In the meantime, non-DNA-based genetic-counselling can prevent spreading of hereditary disease in purebred dog populations." @default.
• W37366012 created "2016-06-24" @default.
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• W37366012 date "2004-09-23" @default.
• W37366012 modified "2023-09-23" @default.
• W37366012 title "A long-term follow up study of a birth cohort of boxer dogs in The Netherlands : genetic and environmental risk factors for diseases" @default.
• W37366012 hasPublicationYear "2004" @default.
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