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Genetic evaluation of swedish warmblood horses

Viklund, Åsa (2010). Genetic evaluation of swedish warmblood horses. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2010:48
ISBN 978-91-576-7461-6
[Doctoral thesis]

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Abstract

The main breeding objective for the Swedish Warmblood horse (SWB) is to produce competitive horses for show jumping or dressage. The aim of this thesis was to provide information to improve the breeding programme for SWB by investigating the usefulness of different sources of data for genetic evaluation and by studying the realised selection practices and genetic trends of the SWB population. Data from three information sources were used in the analyses: competitions (in show jumping and dressage), young-horse test for 3-year-olds (YHT) and riding horse quality test (RHQT) for 4-year-old horses. At YHT and RHQT the horses are subjectively scored for conformation, gaits and jumping ability. The moderate to high heritabilities and high genetic correlations between different traits showed that all three information sources could be integrated in the genetic evaluation with a multi-trait BLUP animal model. The main objective is to breed horses that can achieve good lifetime competition results, and results from YHT and RHQT provide early information of the horses. Multiple information sources allow many horses to be tested, leading to accurate breeding values (EBVs) and opportunities for high selection intensity. Competition and RHQT data go back to the early 1970’s and the traits have changed over time due to development of the sport, change in the population and breeding objective, and change in judging at RHQT. The analyses showed that all data can be used in the genetic evaluation to estimate reliable and unbiased EBVs. The genetic progress in both dressage and show jumping increased considerably in the mid 1980’s due to stronger selection of stallions at the improved stallion performance test in the late 1970’s, importation of superior stallions, introduction of young-horse testing at RHQT, and the beginning of predicting EBVs based on RHQT data with a BLUP animal model in 1986. The genetic trend of broodmares followed the same trend as non-selected horses, and the achieved genetic progress was primarily a result of stallion selection. In the future, emphasis should be put on more effective use of EBVs for selection of stallions and mares, both at young age and when progenies of stallions have been tested.

Authors/Creators:Viklund, Åsa
Title:Genetic evaluation of swedish warmblood horses
Year of publishing :2010
Volume:2010:48
Number of Pages:57
Papers/manuscripts:
NumberReferences
ALLI. Viklund, Å., Thorén Hellsten, E., Näsholm, A., Strandberg, E. and Philipsson, J. (2008). Genetic parameters for traits evaluated at field tests of 3- and 4-year-old Swedish Warmblood horses. Animal 2(12), 1832-1841. II. Viklund, Å., Braam, Å., Näsholm, A., Strandberg, E. and Philipsson, J. (2010). Genetic variation in competition traits at different ages and time periods and correlations with traits at field tests of 4-year-old Swedish Warmblood horses. Animal 4(5), 682-691. III. Viklund, Å., Näsholm, A., Strandberg, E. and Philipsson, J. (2010). Effects of long-time series of data on genetic evaluations for performance of Swedish Warmblood horses. Animal, in press, doi:10.1017/S1751731110001175. IV. Viklund, Å., Näsholm, A., Strandberg, E. and Philipsson, J. (2010). Genetic trends for performance of Swedish Warmblood horses. (submitted to Livestock Science).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7461-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:horses, animal breeding, breeding value, animal performance, heritability. genetic correlation, trends
Keywords:horse breeding, genetic evaluation, breeding value, performance tests, heritability, genetic correlation, genetic trend
URN:NBN:urn:nbn:se:slu:epsilon-3088
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3088
ID Code:2336
Department:(VH) > Dept. of Animal Breeding and Genetics
Deposited By: Åsa Viklund
Deposited On:31 Aug 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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