Zentralinstitut für Mathematik und Mechanik der Akademie der Wissenschaften der DDR, Berlin.
Theor Appl Genet. 1974 Jan;44(2):63-8. doi: 10.1007/BF00277954.
In a simulation study, the efficiency of some selection indices was tested under various parameter combinations. For the purpose of such comparison a criterion, named as 'evaluation coefficient' was developed. In the evaluation coefficient both the total genetic gain and the relative gains obtained in the individual traits, as a measure of harmony, were taken into consideration.The results have indicated that the genotypically constructed selection indices were more efficient than the phenotypically constructed selection index of Elston (1963). Furthermore, the effectiveness of selection indices, irrespective of the model used, was found to be decreased in case of tight linkage as compared to that of loose linkage. It was, however, observed that the genotypically constructed indices were more sensitive to linkage and the reduction in their performance was relatively greater if characters included in the index had varying heritability coefficients. The efficiency of the indices was also reduced when the characters incorporated in the index possessed different economic weights. The results, however, suggested that relatively faster rate of improvement in the character having low heritability could be obtained by assigning higher economic weights to that character. This would mean that, manipulation of economic weights may help in bringing about the harmonical improvement in all the characters to be selected simultaneously.
在一项模拟研究中，测试了在各种参数组合下一些选择指数的效率。为了进行这种比较，开发了一个名为“评估系数”的标准。在评估系数中，综合了遗传总增益和个体特征的相对增益，作为和谐的衡量标准。结果表明，基于基因型构建的选择指数比 Elston（1963 年）的基于表型构建的选择指数更有效。此外，无论使用哪种模型，与松连锁相比，紧连锁情况下选择指数的有效性都会降低。然而，观察到基于基因型构建的指数对连锁更为敏感，如果指数中包含的特征具有不同的遗传力系数，其性能的降低相对更大。当指数中包含的特征具有不同的经济权重时，指数的效率也会降低。然而，结果表明，通过为该特征分配更高的经济权重，可以相对更快地提高遗传力较低的特征的改进速度。这意味着，操纵经济权重可能有助于同时选择的所有特征实现和谐的改进。
