Genetic evaluation of Swedish standard-bred trotters for racing performance traits and racing status
Genetic evaluation of Swedish standard-bred trotters for racing performance traits and racing status
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DOI：
10.1046/j.1439-0388.1999.00202.x
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发表时间：
1999-10-01
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：
Arnason, T
对目前瑞典标准繁育猪蹄遗传评估应用的 AM-BLUP 方法进行了回顾。脱轨中描述了全或非特征赛车状态和五种连续赛车性能特征的多特征评估的计算程序。该过程涉及通过 EM 算法为未参赛的马生成预期值，该预期值在每轮迭代中更新，以促进记录的规范转换。通过比较基于多性状程序的选择与仅基于赛马记录的 ST-BLUP（赛马表现单性状动物模型）的选择，证实了该程序的有效性。 MT-BLUP（多性状动物模型程序，包括比赛状态和表现作为两个相关性状）过程被证明可以消除偏差并显着提高选择的准确性和精确度。当前模型的遗传参数通过从整个数据回归子采样数据的 BLUP 解来评估（方法 R）。结果表明，当前使用的遗传力略有增加，保持相同的协方差结构，导致与预期 R 值非常接近。
The currently applied AM-BLUP methodology for genetic evaluations of the standard-bred trotters in Sweden was reviewed. The computational procedure for multiple trait evaluation of the all-or-non trait racing status and five continuous racing performance traits was described in derail. The procedure involves generating expected Values by the EM algorithm for unraced horses, which are updated in each round of Iteration, in order to facilitate canonical transformation of records. The validity of the procedure was confirmed by comparing selection based on the multiple trait procedure with selection on ST-BLUP (single trait animal model for racing performance), based on records of raced horses only. The MT-BLUP (multiple trait animal model procedure including racing status and performance as two correlated traits) process was shown to remove bias and increase both the accuracy and precision of selection considerably. The genetic parameters of the current model were evaluated by regressing BLUP solutions from the whole data on solutions from subsampled data (method R). The results showed that a slight increase of the currently used heritabilities, maintaining the same covariance structure, resulted in a very close fit to the expected R-values of one.