您好，欢迎访问广东省农业科学院 机构知识库！
广东省农业科学院机构知识库

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

The effect of the H-1 scaling factors tau and omega on the structure of H in the single-step procedure

文献类型： 外文期刊

作者： Martini, Johannes W. R. 1 ; Schrauf, Matias F. 2 ; Garcia-Baccino, Carolina A. 2 ; Pimentel, Eduardo C. G. 3 ; M 1 ;

作者机构： 1.KWS SAAT SE, Einbeck, Germany

2.Univ Buenos Aires, Dept Prod Anim, Fac Agron, Buenos Aires, DF, Argentina

3.Bavarian State Res Ctr Agr, Inst Anim Breeding, Poing Grub, Germany

4.Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina

5.UNLP, Fac Ciencias Vet, IGEVET Inst Genet Vet, CONICET LA PLATA, La Plata, Buenos Aires, Argentina

6.UBA, INPA, CONICET, Buenos Aires, DF, Argentina

7.Univ Goettingen, Ctr Integrated Breeding Res, Anim Breeding & Genet Grp, Gottingen, Germany

8.South China Agr Univ, Coll Anim Sci, Natl Engn Res Ctr Breeding Swine Ind, Guangdong Prov Key Lab Agroanim Genom & Mol Breed, Guangzhou, Guangdong, Peoples R China

期刊名称：GENETICS SELECTION EVOLUTION （ 影响因子：4.297； 五年影响因子：4.925 ）

ISSN： 0999-193X

年卷期： 2018 年 50 卷

页码：

收录情况： SCI

摘要： Background: The single-step covariance matrix H combines the pedigree-based relationship matrix A with the more accurate information on realized relatedness of genotyped individuals represented by the genomic relationship matrix G. In particular, to improve convergence behavior of iterative approaches and to reduce inflation, two weights tau and omega have been introduced in the definition of H-1, which blend the inverse of a part of A with the inverse of G. Since the definition of this blending is based on the equation describing H-1, its impact on the structure of H is not obvious. In a joint discussion, we considered the question of the shape of H for non-trivial tau and omega. Results: Here, we present the general matrix H as a function of these parameters and discuss its structure and properties. Moreover, we screen for optimal values of tau and omega with respect to predictive ability, inflation and iterations up to convergence on a well investigated, publicly available wheat data set. Conclusion: Our results may help the reader to develop a better understanding for the effects of changes of tau and omega on the covariance model. In particular, we give theoretical arguments that as a general tendency, inflation will be reduced by increasing tau or by decreasing omega.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：广东省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台