Genetic analysis of 'breeding field test status' in Icelandic horses
Genetic analysis of 'breeding field test status' in Icelandic horses
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DOI：
10.1111/j.1439-0388.2010.00902.x
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发表时间：
2011-04-01
影响因子：
2.6
通讯作者：
Arnason, T.
中科院分区：
文献类型：
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作者：
Albertsdottir, E.;Eriksson, S.;Arnason, T.
冰岛马的遗传评估目前是基于繁殖现场测试的结果，在1-2天的时间内评估马的骑术和形态。只有一小部分登记的马参加这些实地测试，可以假设这些马不是随机抽样的。在这项研究中，介绍了性状测试状态，描述了一匹马是否在育种现场测试中进行评估。对该性状进行分析，以确定其是否具有遗传变异，以及它与育种目标中的其他性状在遗传上如何相关。繁殖现场试验数据包括1990-2001年在冰岛出生的39443只小山羊，其中7431只在1994-2007年期间进行了评估。该性状与马的年龄、性别和种马有关。通过在DMU程序中应用Gibbs抽样程序，使用马尔可夫链蒙特卡罗方法估计方差和协方差分量。进行了三个多变量分析，其中测试状态性状与育种现场测试性状一起分析。采用动物模型和公畜模型。根据遗传力（0.51-0.67）和遗传相关（0.00-0.87）的估计，测试状态性状显示出显著的遗传变异，并与某些性状强相关。试验状态性状反映了育种现场试验性状的预选，应将其纳入遗传评价，以提高评价程序，减少选择偏倚，提高评价的准确性。
P>Genetic evaluation of Icelandic horses is currently based on results from breeding field tests where riding ability and conformation of the horses are evaluated over the course of 1-2 days. Only a small part of registered horses attend these field tests, and it can be assumed that these are not a random sample of the population. In this study, the trait test status was introduced, describing whether a horse was assessed in a breeding field test. This trait was analysed to find out whether it has a genetic variation and how it correlates genetically to other traits in the breeding goal. Breeding field test data included 39 443 mares born in Iceland in 1990-2001, of which 7431 were assessed in the period 1994-2007. The trait was defined in relation to age, gender and stud of horses. Variance and covariance components were estimated using the Markov Chain Monte Carlo method by applying the Gibbs sampler procedure in the DMU program. Three multivariate analyses were performed where the test status trait was analysed with breeding field test traits. Animal models and sire models were applied. Based on estimated heritabilities (0.51-0.67) and genetic correlations (0.00-0.87), the test status trait showed significant genetic variation and was strongly correlated to some traits. The test status trait reflects preselection in the breeding field test traits and should be included in the genetic evaluation to enhance the procedure, reduce selection bias and increase accuracy of the estimation.