Comparison of estimates of hip dysplasia genetic parameters in Estrela Mountain Dog using linear and threshold models

Genetic parameters, breeding values, and genetic trends of hip dysplasia in Estrela Mountain Dogs were estimated using a linear model (LM) and a threshold model (TM). A database with 313 animals was used. Right and left hip joints were individually scored, according to the Fédération Cynologic Inter...

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Bibliographic Details
Published in:Journal of animal science 2007-08, Vol.85 (8), p.1880-1884
Main Authors: Silvestre, A.M, Ginja, M.M.D, Ferreira, A.J.A, Colaco, J
Format: Article
Language:English
Subjects:
Animal productions
Animals
Biological and medical sciences
Breeding
Breeding of animals
breeding value
canine hip dysplasia
Cell growth
dog breeds
dog diseases
Dogs
Epstein-Barr virus
estimation
Estrela Mountain Dog (dog breed)
Female
Fundamental and applied biological sciences. Psychology
genetic correlation
genetic merit
Genetics
Genotype & phenotype
heritability
Hip Dysplasia, Canine - genetics
hips
Linear Models
Male
measurement
Models, Statistical
prediction
quantitative traits
selection criteria
Severity of Illness Index
Terrestrial animal productions
threshold models
Time Factors
Vertebrates
Zoology
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Summary:Genetic parameters, breeding values, and genetic trends of hip dysplasia in Estrela Mountain Dogs were estimated using a linear model (LM) and a threshold model (TM). A database with 313 animals was used. Right and left hip joints were individually scored, according to the Fédération Cynologic Internationale grading rules of the canine hip dysplasia system, as normal (1), borderline (2), slight (3), moderate (4), and severe (5 and 6). The estimate of repeatability was lower in LM (0.86) than in TM (0.90). The same tendency was verified with the heritability because its estimate in LM was 0.38 and in TM was 0.43. However, these results did not establish any statistical differences between the models. The genetic trend of canine hip dysplasia for LM and TM showed a similarity in shape, but considerable individual differences were found in the EBV ranking lists. Therefore, the selection of breeding animals would not be the same with the 2 methodologies. To select the best method for genetic evaluation of hip dysplasia, further studies using more data and other dog breeds are required.
ISSN:0021-8812
1525-3163
DOI:10.2527/jas.2007-0166