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Effects of using phenotypic means and genotypic values in GGE biplot analyses on genotype by environment studies on tropical maize (Zea mays). Repositório Alice
GRANATO, I. S. C.; FRITSCHE-NETO, R.; RESENDE, M. D. V. de; SILVA, F. F..
The objective of this study was to examine the effects of the type and intensity of nutritional stress, and of the statistical treatment of the data, on the genotype x environment (G x E) interaction for tropical maize (Zea mays). For this purpose, 39 hybrid combinations were evaluated under low- and high-nitrogen and -phosphorus availability. The plants were harvested at the V6 stage, and the shoot dry mass was estimated. The variance components and genetic values were assessed using the restricted maximum likelihood/best linear unbiased prediction method, and subsequently analyzed using the GGE biplot method. We observed differences in the performances of the hybrids depending on both the type and intensity of nutritional stress. The results of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Maize; Nitrogen-use efficiency; Phosphorous-use efficiency; Mixed model; Principal component; Modelo mixto; Zea mays; Milho; Nutriente mineral; Corn; Nutrient use efficiency.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1072717
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Genomic prediction for additive and dominance effects of censored traits in pigs. Repositório Alice
SANTOS, V. S.; MARTINS FILHO, S.; RESENDE, M. D. V. de; AZEVEDO, C. F.; LOPES, P. S.; GUIMARÃES, S. E. F.; SILVA, F. F..
Age at the time of slaughter is a commonly used trait in animal breeding programs. Since studying this trait involves incomplete observations (censoring), analysis can be performed using survival models or modified linear models, for example, by sampling censored data from truncated normal distributions. For genomic selection, the greatest genetic gains can be achieved by including non-additive genetic effects like dominance. Thus, censored traits with effects on both survival models have not yet been studied under a genomic selection approach. We aimed to predict genomic values using the Cox model with dominance effects and compare these results with the linear model with and without censoring. Linear models were fitted via the maximum likelihood method....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: GBLUP; Modelo mixto; Censored data; Mixed model; Survival models; Porco; Suíno; Swine; Animal breeding.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1072712
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Genomic selection for slaughter age in pigs using the Cox frailty model. Repositório Alice
SANTOS, V. S.; MARTINS FILHO, S.; RESENDE, M. D. V. de; AZEVEDO, C. F.; LOPES, P. S.; GUIMARAES, S. E. F.; GLORIA, L. S.; SILVA, F. F..
The aim of this study was to compare genomic selection methodologies using a linear mixed model and the Cox survival model. We used data from an F2 population of pigs, in which the response variable was the time in days from birth to the culling of the animal and the covariates were 238 markers [237 single nucleotide polymorphism (SNP) plus the halothane gene]. The data were corrected for fixed effects, and the accuracy of the method was determined based on the correlation of the ranks of predicted genomic breeding values (GBVs) in both models with the corrected phenotypic values. The analysis was repeated with a subset of SNP markers with largest absolute effects. The results were in agreement with the GBV prediction and the estimation of marker effects...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Dado censurado; Modelo mixto; Polimorfismo; Censured data; Mixed model; Polymorphism.
Ano: 2015 URL: http://dx.doi.org/10.4238/2015.October.19.5
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