scholarly journals Estimation of Genotypic Correlation and Heritability of some of Traits in Faba Bean Genotypes Using Restricted Maximum Likelihood (REML)

2020 ◽  
Vol 6 (2) ◽  
pp. 111-128
Author(s):  
Hossein Astaraki ◽  
Peyman Sharifi ◽  
Fatemeh Sheikh ◽  
◽  
◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Faba Bean ◽  
Restricted Maximum Likelihood ◽  
Genotypic Correlation

Estimation of genotypic correlation and heritability of apricot traits, using restricted maximum likelihood in repeated measures data

2016 ◽  
Vol 96 (3) ◽  
pp. 439-447 ◽  
Author(s):  
Ahmad Ismaili ◽  
Farhad Karami ◽  
Omidali Akbarpour ◽  
Abdolhossein Rezaei Nejad
Keyword(s):  
Maximum Likelihood ◽  
Repeated Measures ◽  
Mixed Model ◽  
Covariance Structure ◽  
Restricted Maximum Likelihood ◽  
Environment Interaction ◽  
Genotypic Correlation ◽  
Model Based ◽  
Repeated Measures Data ◽  
Heritability Estimation

In estimation of genetic parameters in perennial tree species on the basis of analysis of variance (ANOVA), heterogeneity of years and genotype × environment interaction for data sets during the juvenility to maturity life period is ignored. Therefore, a linear mixed model based on restricted maximum likelihood (REML) approximation for modeling of covariance structure of longitudinal data can improve our ability to analyze repeated measures data. In the present research, a modeling of variance-covariance structure by mixed model based on the REML approach has been used for characteristics of 26 apricot genotypes recorded during three years. Fitting unstructured covariance (UN) models for all traits indicated a great heterogeneity of variances among repeated years and the trends of response variables in the genotypes (except for RWC) was due to imperfect correlation of subjects measured in different years. Based on the same structure, positive correlations were estimated among fruit set, potassium content, and yield of pistil in repetitive years, and most traits showed high heritability estimation. To our knowledge, this is the first report in plant that genotypic correlation and heritability and their standard errors are estimated in a repeated measures data over years using REML approximation.

Bias in heritability estimates from genomic restricted maximum likelihood methods under different genotyping strategies

2018 ◽  
Vol 136 (1) ◽  
pp. 40-50 ◽  
Author(s):  
Alberto Cesarani ◽  
Ivan Pocrnic ◽  
Nicolò P. P. Macciotta ◽  
Breno O. Fragomeni ◽  
Ignacy Misztal ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Restricted Maximum Likelihood ◽  
Likelihood Methods ◽  
Maximum Likelihood Methods ◽  
Heritability Estimates

scholarly journals Morphometric Evaluation of Phenotypic Groups of Creole Cattle of Southern Ecuador

Diversity ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 221 ◽  
Author(s):  
Edgar Lenin Aguirre-Riofrio ◽  
Rodrigo Medardo Abad-Guamán ◽  
Melania de Lourdes Uchuari-Pauta
Keyword(s):  
Maximum Likelihood ◽  
Live Weight ◽  
Restricted Maximum Likelihood ◽  
Morphometric Characteristics ◽  
Body Depth ◽  
Dual Purpose ◽  
The Andes ◽  
Economic Support ◽  
Significant Difference ◽  
Creole Cattle

The breeding of creole cattle from the southern region of Ecuador, also known as Criollo Lojano, is a source of economic support and work for the communities located in the remote areas of the Andes mountains in this region. These cattle are grouped into four biotypes based on their phenotypic characteristics: Negro Lojano, Encerado, Colorado, and Cajamarca or Pintado. This study analyzes the morphometric variability of these creole cattle using least squares means (LSM) and restricted maximum likelihood Restricted Maximum Likelihood (REML) variance components. The evaluation parameters used to characterize these cattle were live weight plus 15 morphometric characteristics and nine morphometric indexes. The measurements came from 151 adult animals (28 male and 123 females). With the exception of Height at Withers (P = 0.06), the other morphometric characteristics do not show significant difference among these creole biotypes. Sexual dimorphism was found in live weight, thoracic circumference, height at withers, chest width, length of thorax, length of body, depth of thorax, depth of abdomen, length of head, and length of horns (P < 0.05). The adult Creole Lojano has an average live weight of 288 ± 12.9 kg (mean ± standard error), The Cephalic index is 45.6, the Corporal index is 115.9, the Pelvic index is 90.5, the Thoracic index is 58.3, the Proportionality index is 62.6, the Thoracic Capacity index is 2.1, the Lower Leg–Thoracic index is 9.9, the Transverse Pelvic index is 34.7, and the Pelvic Length index is 38.4. This creole bovine breed presents 4 biotypes that are similar; there are differences in the analysis with respect to sex (males are higher in 10 of the 16 characteristics analyzed); and on the basis of the indexes, this animal is small, has a triangular head, is longilinear with a long and narrow hip. It is a dual-purpose milk type with the exception of the Colorado biotype which is a dual purpose meat type.

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