Influence of heterogeneity of variances on genetic evaluation of Tabapua beef cattle

被引:2
|
作者
Campelo, JEG
Lopes, PS
Torres, RA
Silva, LOC
Euclydes, RF
Araújo, C
Pereira, CS
机构
[1] Univ Fed Piaui, Dept Zootecnia, Ctr Ciencias Agrarias, BR-64049550 Teresina, PI, Brazil
[2] Univ Fed Vicosa, Dept Zootecnia, BR-36570 Vicosa, MG, Brazil
[3] EMBRAPA, Gado Corte, Campo Grande, MS, Brazil
[4] Univ Fed Vicosa, Estudante Doutorado, BR-36570 Vicosa, MG, Brazil
[5] Univ Fed Vicosa, Profa Visitante, BR-36570 Vicosa, MG, Brazil
关键词
genetic-environment interaction; genetic parameters; heterogeneity of variances; variance components;
D O I
10.1590/S0102-09352003000600006
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Data front Tabapua beef cattle were used to study the influence of variance heterogeneity on genetic evaluation. Adjusted weights at 120, 240 and 420 days of age were classified in three classes of standard deviation: low (<14.9kg), medium (14.9 to 18.9 kg) and high (>18.9 kg), based on phenotypic standard deviation of the weight at 120 days of age of the contemporary groups. Multiple trait analyses, considering each class of phenotypic standard deviation as a distinct trait, were performed. The genetic and residual variances increased as the phenotypic standard deviation of the class increased. Heritabilities for low, medium and high phenotypic standard deviation classes were 0.26, 0.32 and 0.37 (weight at 120 days), 0.28, 0.35 and 0.35 (weight at 240 days) and 0.14, 0.18 and 0.18 (weight at 420 days), respectively. Genetic correlations between the same weight, in low and high phenotypic standard deviation classes were lower than 0.80. The correlation between the breeding values, obtained from multiple trait analyses, and from general analyses (without classes), were greater than 0.93. It was observed that sires would be classified in similar way considering or not considering the heterogeneity of variances in the analyses.
引用
收藏
页码:685 / 693
页数:9
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