Article (Scientific journals)
Multi-trait animal model estimation of genetic parameters for linear type and gait traits in the Belgian warmblood horse
Rustin, M.; Janssens, S.; Buys, N. et al.
2009In Journal of Animal Breeding and Genetics, 126 (5), p. 378-386
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Keywords :
conformation; gait; genetic parameters; linear scoring; warmblood horse
Abstract :
[en] Summary Genetic parameters for the height at withers, 27 linear type and six linear gait traits were estimated for the Belgian warmblood horse. Observations on 987 mares, mostly 3 years old, were analysed using a multi-trait animal model. The statistical model included appraiser, age and location (date × place of appraisal) as fixed effects. Genetic parameters were estimated using a canonical transformation and an expectation-maximization restricted maximum likelihood algorithm with an additional deceleration step. Estimates of heritability for the 33 linear traits were between 0.15 and 0.55. Heritability of the height at withers was 0.34 ± 0.06. Estimated genetic correlations ranged from −0.60 to 0.98 with an average SE of 0.10. The highest positive correlations were found among traits of walk and among traits of trot. Volume and the quality of legs were the most negatively correlated. Estimated genetic parameters indicated that the linear scoring system is a valuable tool to assess conformation. The full (co)variance matrix is now available for breeding value estimation to support selection for conformation and gaits.
Disciplines :
Genetics & genetic processes
Animal production & animal husbandry
Author, co-author :
Rustin, M.
Janssens, S.
Buys, N.
Gengler, Nicolas  
Language :
English
Title :
Multi-trait animal model estimation of genetic parameters for linear type and gait traits in the Belgian warmblood horse
Publication date :
2009
Journal title :
Journal of Animal Breeding and Genetics
ISSN :
0931-2668
eISSN :
1439-0388
Publisher :
Blackwell Publishing, Berlin, Germany
Volume :
126
Issue :
5
Pages :
378-386
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 March 2011

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