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Genetic analysis of competition traits in Icelandic horses

Albertsdóttir, Elsa (2007). Genetic analysis of competition traits in Icelandic horses. Uppsala : Sveriges lantbruksuniv. , Rapport / SLU, Institutionen för husdjursgenetik, 1401-7520 ; 145
ISBN 978-91-576-7195-0
[Licentiate thesis]

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The aim of this thesis was to explore the basis for including competition traits in the genetic evaluations of the Icelandic horse. This evaluation is currently based on breeding field-test traits. For this purpose knowledge about genetic parameters of the competition traits, and of genetic relationships between competition traits and the breeding field-test traits was required. A data-set including 18 982 records of 3790 horses competing in Iceland and Sweden 1998 – 2004 were analysed using linear animal models. The traits analysed were two different measures of four-gait, five-gait and tölt, and one pace trait. Additionally, new combined traits were formed and analysed in order to describe the competition traits in simpler manner. The estimated heritabilities were low to moderately high (0.18 – 0.35) for all competition traits. The genetic correlations estimated among competition traits (-0.42 – 1.00) were generally strong and favourable with a few exceptions. Genetic relationships were estimated between breeding field-test traits and combined competition traits, along with one original competition trait (pace). The breeding field-test data included 16 401 individual records of Icelandic horses evaluated in 11 countries during 1990–2005. Furthermore, genetic parameters of the breeding field-test traits were reanalysed and confirmed earlier results. Moderate genetic correlations were estimated between most of the competition traits and some of the conformation traits judged in breeding field-tests. High genetic correlations were generally estimated between the competition traits and most of the riding ability traits recorded in breeding field-tests. It was concluded that competition traits can be added to current genetic evaluations of the Icelandic horse. Heritability estimates and results from statistical analyses for the combined traits, indicated that these traits were the most promising kind to use to complement the genetic evaluation. The original competition trait, pace test, should also be included in the genetic evaluation. Relationships between competition traits and breeding field-test traits showed that information on competition traits could improve the accuracy of the genetic evaluation of the breeding field-test traits if the data are used simultaneously. However, a sufficient quantity of competition data needs to be made available in the future, and data collections should be standardized.

Authors/Creators:Albertsdóttir, Elsa
Title:Genetic analysis of competition traits in Icelandic horses
Series Name/Journal:Rapport / SLU, Institutionen för husdjursgenetik
Year of publishing :February 2007
Number of Pages:24
ALLAlbertsdottir, E., Eriksson, S., Näsholm, A., Strandberg, E., Árnason, Th. 2006. Genetic analysis of competition data on Icelandic horses. Livest. Sci., In press. Albertsdottir, E., Eriksson, S., Näsholm, A., Strandberg, E., Árnason, Th. 2007. Genetic correlations between competition traits and traits scored at breeding field-tests in Icelandic horses. Submitted for publication.
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7195-0
Publication Type:Licentiate thesis
Full Text Status:Public
Agrovoc terms:saddle horses, genetic correlation, heritability, breeding value, animal models, animal performance, performance testing, iceland, sweden
Keywords:Horse, Genetic evaluation, Breeding field-test, Competition, Genetic correlations, Iceland, Sweden.
Permanent URL:
ID Code:1347
Department:(VH) > Dept. of Animal Breeding and Genetics
Deposited By: Elsa Albertsdóttir
Deposited On:27 Feb 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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