A predictive assessment of genetic correlations between traits in chickens using markers

Genetics Selection Evolution

Research Article

Ahmad Ayatollahi Mehrgardi¹  Mehdi Momen¹  Masood Asadi Fozi¹  Ali Esmailizadeh²  Bruno D. Valente³  Guilherme J. M. Rosa⁴  Daniel Gianola⁵  Ayoub Sheikhy⁶  Andreas Kranis⁷ 

[1] Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman (SBUK), Kerman, Iran;Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman (SBUK), Kerman, Iran;State Key Laboratory of Genetic Resources and Evolution, Yunnan Laboratory of Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, 650223, Kunming, China;Department of Animal Sciences, University of Wisconsin, Madison, WI, USA;Department of Animal Sciences, University of Wisconsin, Madison, WI, USA;Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison, WI, USA;Department of Animal Sciences, University of Wisconsin, Madison, WI, USA;Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison, WI, USA;Department of Dairy Science, University of Wisconsin, Madison, WI, USA;Department of Statistical, Faculty of Mathematic and Computer Science, Shahid Bahonar University of Kerman (SBUK), Kerman, Iran;Roslin Institute, University of Edinburgh, Midlothian, UK;

关键词: Quantitative Trait Locus;    Genetic Correlation;    Genomic Selection;    Genomic Prediction;    Genomic Relationship;   

DOI  :  10.1186/s12711-017-0290-9

 received in 2016-07-16, accepted in 2017-01-16,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundGenomic selection has been successfully implemented in plant and animal breeding programs to shorten generation intervals and accelerate genetic progress per unit of time. In practice, genomic selection can be used to improve several correlated traits simultaneously via multiple-trait prediction, which exploits correlations between traits. However, few studies have explored multiple-trait genomic selection. Our aim was to infer genetic correlations between three traits measured in broiler chickens by exploring kinship matrices based on a linear combination of measures of pedigree and marker-based relatedness. A predictive assessment was used to gauge genetic correlations.MethodsA multivariate genomic best linear unbiased prediction model was designed to combine information from pedigree and genome-wide markers in order to assess genetic correlations between three complex traits in chickens, i.e. body weight at 35 days of age (BW), ultrasound area of breast meat (BM) and hen-house egg production (HHP). A dataset with 1351 birds that were genotyped with the 600 K Affymetrix platform was used. A kinship kernel (K) was constructed as K = λG + (1 − λ)A, where A is the numerator relationship matrix, measuring pedigree-based relatedness, and G is a genomic relationship matrix. The weight (λ) assigned to each source of information varied over the grid λ = (0, 0.2, 0.4, 0.6, 0.8, 1). Maximum likelihood estimates of heritability and genetic correlations were obtained at each λ, and the “optimum” λ was determined using cross-validation.ResultsEstimates of genetic correlations were affected by the weight placed on the source of information used to build K. For example, the genetic correlation between BW–HHP and BM–HHP changed markedly when λ varied from 0 (only A used for measuring relatedness) to 1 (only genomic information used). As λ increased, predictive correlations (correlation between observed phenotypes and predicted breeding values) increased and mean-squared predictive error decreased. However, the improvement in predictive ability was not monotonic, with an optimum found at some 0 < λ < 1, i.e., when both sources of information were used together.ConclusionsOur findings indicate that multiple-trait prediction may benefit from combining pedigree and marker information. Also, it appeared that expected correlated responses to selection computed from standard theory may differ from realized responses. The predictive assessment provided a metric for performance evaluation as well as a means for expressing uncertainty of outcomes of multiple-trait selection.

【 授权许可】

CC BY   
© The Author(s) 2017

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