scholarly journals Estimation of Genetic Parameters of Body Weight Traits in Ghezel Sheep

2009 ◽  
Vol 23 (2) ◽  
pp. 149-153 ◽  
Author(s):  
Hasan Baneh ◽  
Seyed Hasan Hafezian ◽  
Amir Rashidi ◽  
Mohsen Gholizadeh ◽  
Ghodrat Rahimi
Keyword(s):  
Body Weight ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

scholarly journals Estimation of Genetic Parameters for Body Weight and Some Colour Traits in the Seventh-generation Index Selected Nigeria Heavy Local Chicken Ecotype

2021 ◽  
Author(s):  
I.J. Ohagenyi ◽  
F.C. Iregbu ◽  
V.C. Udeh
Keyword(s):  
Body Weight ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
The Body ◽  
Pedigree Selection ◽  
Egg Colour ◽  
Local Chicken ◽  
Range Test ◽  
Estimation Of Genetic Parameters ◽  
Selection Of

Background: This study was conducted to estimate the genetic parameters of body weight and some colour traits in seventh generation (G7) index selected Nigerian Heavy Local Chicken Ecotype (NHLCE) progenies at point of lay to 12 weeks. Methods: 5 sires and 12 hens were used to generate the progenies used for the experiment. Traits measured included weekly body weight, egg colour, beak colour and feather colour. Data collected were subjected to one way analysis of variance in a Paternal half sib analysis using Animal model of SAS (2003). Four weeks body weight measurements, egg colour, beak colour and feather colour for 5 sires ranged from 1.29±0.05 1.54±0.07; 2.55±0.02 to 4.00±0.02; 2.45±0.02 to 4.83±0.02 and 1.73±0.02 to 4.58±0.04 respectively. Result: The new Duncan’s multiple range test shows that sire families are similar (p greater than 0.05) in the body weight and beak colour, but significantly differed (p greater than 0.05) in the egg colour and feather colour. The heritability estimates of mature body weight for week 3 was medium, while estimates of heritability for weekly mature body weight for weeks 1, 2 and 4, egg colour, beak colour and feather colour of NHLCE were low heritability. Low h2 of traits suggest that progeny and pedigree selection could be employed for improvement of the egg colour, beak colour and feather colour of NHLCE. The study showed positive genetic correlations between beak colour and egg colour, negative genetic correlations between beak and feather colour. This means that no decision can be taken in isolation as the selection of one trait will have consequences on other traits.

scholarly journals Model comparison and estimation of genetic parameters for body weight in commercial broilers

2013 ◽  
Vol 93 (1) ◽  
pp. 67-77 ◽  
Author(s):  
G. Maniatis ◽  
N. Demiris ◽  
A. Kranis ◽  
G. Banos ◽  
A. Kominakis
Keyword(s):  
Body Weight ◽  
Akaike Information Criterion ◽  
Model Evaluation ◽  
Model Comparison ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Information Criterion ◽  
Biological Properties ◽  
Genetic Covariance ◽  
Estimation Of Genetic Parameters

Maniatis, G., Demiris, N., Kranis, A., Banos, G. and Kominakis, A. 2013. Model comparison and estimation of genetic parameters for body weight in commercial broilers. Can. J. Anim. Sci. 93: 67–77. The availability of powerful computing and advances in algorithmic efficiency allow for the consideration of increasingly complex models. Consequently, the development and application of appropriate statistical procedures for model evaluation is becoming increasingly important. This paper is concerned with the application of an alternative model determination criterion (conditional Akaike Information Criterion, cAIC) in a large dataset comprising 203 323 body weights of broilers, pertaining to 7 (BW7) and 35 (BW35) days of age. Seven univariate and seven bivariate models were applied. Direct genetic, maternal genetic and maternal environmental (c2) effects were estimated via REML. The model evaluation criteria included conditional Akaike Information Criterion (cAIC), Bayesian Information Criterion (BIC) and the standard Akaike Information Criterion (henceforth marginal; mAIC). According to cAIC the best-fitting model included direct genetic, maternal genetic and c2 effects. Maternal heritabilities were low (0.10 and 0.03) compared to the direct heritabilities (0.17 and 0.21), while c2 was 0.05 and 0.04 for BW7 and BW35, respectively. BIC and mAIC favoured a model that additionally included a direct-maternal genetic covariance, resulting in highly negative direct-maternal genetic correlations (−0.47 and −0.64 for BW7 and BW35, respectively) and higher direct heritabilities (0.25 and 0.28 for BW7 and BW35, respectively). Results suggest that cAIC can select different animal models than mAIC and BIC with different biological properties.

scholarly journals Estimation of genetic parameters for growth related traits at different stages of development in Paralichthys olivaceus (Temminck & Schlegel, 1846)

2016 ◽  
Vol 63 (3) ◽  
Author(s):  
F. Liu ◽  
S. L. Chen ◽  
L. Wang ◽  
Y. P. Zhang ◽  
Y. S. Tian ◽  
...  
Keyword(s):  
Body Weight ◽  
Growth Stage ◽  
Genetic Parameters ◽  
Developmental Stages ◽  
Growth Traits ◽  
Paralichthys Olivaceus ◽  
Correlation Coefficients ◽  
Breeding Value ◽  
Estimated Breeding Value ◽  
Estimation Of Genetic Parameters

Genetic parameters of growth traits at different growing stages of Paralichthys olivaceus (Temminck and Schlegel, 1846) were estimated using 30 families. The estimates of heritability for body weight at four developmental stages viz., 210, 450, 720 and 830 days of age, varied from 0.12 to 0.37. The heritability at 720 days of age was the lowest and that of 450 days was the highest. The maternal effect was 0.08 at 210 days, 0.03 at 450 days and almost zero (8.89 E-8 and 2.40 E-7) at 720 and 830 days. Correlation coefficients of the estimated breeding value (EBV) and phenotypic value (PV) of body weight at different developmental stages were 0.470-0.803, which were highly significant (p<0.01). Correlation of estimated breeding value (EBV) and phenotypic value (PV) was the highest at 210 days of age and the lowest at 720 days. Genetic correlation among the four stages showed large variation (0.339-0.811), which were highly significant except that of 210 and 830 days. The value and accuracy of estimating genetic parameters for growth traits at different stages was different. Therefore, the growth stage should be taken into account when designing a breeding program for growth traits in P. olivaceus.

scholarly journals Estimation of genetic parameters for body weight in Charolais calves in Slovenia

2009 ◽  
Vol 8 (4) ◽  
pp. 735-742
Author(s):  
Marko Čepon ◽  
Mojca Simčič ◽  
Malovrh Ćpela
Keyword(s):  
Body Weight ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for body weight of the Goettingen minipig with random regression models1

2007 ◽  
Vol 85 (10) ◽  
pp. 2423-2428 ◽  
Author(s):  
F. Köhn ◽  
A. R. Sharifi ◽  
Š. Malovrh ◽  
H. Simianer
Keyword(s):  
Body Weight ◽  
Genetic Parameters ◽  
Random Regression ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for body weight traits and pelt quality score in Iranian Karakul sheep

2015 ◽  
Vol 132 ◽  
pp. 67-71
Author(s):  
Seyed Ziaeddin Mirhoseini ◽  
Jalal Zare ◽  
Navid Ghavi Hossein-Zadeh ◽  
Hassan Khanzadeh ◽  
Alireza Seidavi ◽  
...  
Keyword(s):  
Body Weight ◽  
Genetic Parameters ◽  
Quality Score ◽  
Estimation Of Genetic Parameters
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