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Genetic variances, trends and mode of inheritance for hip and elbow dysplasia in Finnish dog populations

Published online by Cambridge University Press:  18 August 2016

K. Mäki1 ,
A. F. Groen ,
A.-E. Liinamo  and
M. Ojala
K. Mäki1*
Affiliation:
Department of Animal Science, PO Box 28, 00014 Helsinki University, Finland
A. F. Groen
Affiliation:
Animal Breeding and Genetics Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands
A.-E. Liinamo
Affiliation:
Farm Animal Industrial Platform, Benedendorpsweg 98, 6862 WL Oosterbeek, The Netherlands
M. Ojala
Affiliation:
Department of Animal Science, PO Box 28, 00014 Helsinki University, Finland
*
E-mail:katariina.maki@animal.helsinki.fi
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Abstract

The aims of this study were to assess genetic variances, trends and mode of inheritance for hip and elbow dysplasia in Finnish dog populations. The influence of time-dependent fixed effects in the model when estimating the genetic trends was also studied. Official hip and elbow dysplasia screening records of 42 421 dogs from seven breeds were analysed with REML. To investigate the mode of inheritance of hip and elbow dysplasia, trait distributions, genetic variances and regressions of offspring phenotypes on parental predicted breeding values were studied separately in males and in females. Genetic trends for hip dysplasia between the years 1983 and 1998 were favourable only in the Rottweiler. In elbow dysplasia, the trends were favourable after the year 1992 in all the four breeds studied but the overall changes were small. The reason for this seemed to be negligible selection pressure against these traits. Time-dependent fixed effects in the model had an influence on the estimated genetic trends, resulting either in a more negative or more positive genetic trend compared with the model from which the time-dependent effects were removed. Mitochondrial or sex-linked inheritance did not seem likely in the expression of hip and elbow dysplasia in the populations studied. Regression coefficients of offspring phenotypes on estimated parental breeding values were approximately equal to their expected value in a situation with equal parental contribution. Furthermore, the phenotypic frequency distributions of hip and elbow dysplasia grades were similar among males and females in each breed studied. No indication of major genes was found in the offspring frequency distributions within individual sires. According to these Finnish data, mode of inheritance for both hip and elbow dysplasia is polygenic (quantitative) with equal expression of the genes from both parents, although the estimates of heritability for hip dysplasia in the Rough Collie and for elbow dysplasia in the German Shepherd and the Golden Retriever were somewhat different in males compared with females.

Keywords

dogsdysplasiagenetic parametersinheritance
Type
Research Article
Information
Animal Science , Volume 75 , Issue 2 , October 2002 , pp. 197 - 207
Copyright
Copyright © British Society of Animal Science 2002

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