Multi-trait estimation of genetic parameters for body weight in a commercial broiler chicken population

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.

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

Canadian Journal of Animal Science ◽

10.4141/cjas2012-070 ◽

2013 ◽

Vol 93 (1) ◽

pp. 67-77 ◽

Cited By ~ 5

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.

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AIREML estimation of genetic parameters and study of factors affecting growth and fertility performance of sire line of IBL-80 broiler chicken

Indian Journal of Animal Research ◽

10.18805/ijar.b-3664 ◽

2019 ◽

Author(s):

Swayamprabha Naik ◽

Shakti Kant Dash ◽

Prem Prakash Dubey ◽

Jaspreet Singh Arora ◽

Saroj Kumar Sahoo ◽

...

Keyword(s):

Broiler Chicken ◽

Genetic Parameters ◽

Negative Association ◽

Growth Line ◽

Additive Variance ◽

Factors Affecting ◽

The Mean ◽

Correlation Estimate ◽

Fertility Traits ◽

Estimation Of Genetic Parameters

The present investigation included the data of 29,879 birds pertaining to 8 generations, from 2010 to 2018 on growth line (PB1) of IBL-80 broiler. The mean estimates of growth and fertility traits were BWT0 (39.97±0.05 gms), BWT5 (1189.17±1.45 gms), BWT10 (1723.59±6.26 gms), BWT15 (2165.71±7.90 gms), BWT20 (2611.23±4.10 gms), ADG5 (32.36±0.07 gms/day), ADG10 (13.09±0.14 gms/day), ADG15 (12.38±0.13 gms/day), ADG20 (12.65±0.13 gms/day), AFE (171.80±0.21 days) and ENO40 (62.47±0.25) which indicated higher growth performance of PB1 affected its fertility performance. ADG5 had highest estimate indicating higher growth during chick stage. Least squares analysis indicated that effect of gender, month of hatch and generation were significant (p less than 0.01) for all growth and fertility traits. AIREML heritability estimates indicated appreciable additive variance in BWT0 (0.50), BWT5 (0.54) and ADG5 (0.20). Other growth and fertility traits had lower heritability which was due to stage wise selection in breeder flock. Phenotypic and genetic correlation estimate indicated negative association between growth and fertility traits.

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Effect of the data family structure, tank replication and the statistical model, on the estimation of genetic parameters for body weight at 28 days of age in the Pacific white shrimp (Penaeus (Litopenaeus) vannamei Boone, 1931)

Aquaculture Research ◽

10.1111/j.1365-2109.2012.03176.x ◽

2012 ◽

pp. n/a-n/a ◽

Cited By ~ 3

Author(s):

Hugo H Montaldo ◽

Héctor Castillo-Juárez ◽

Gabriel Campos-Montes ◽

Miguel Pérez-Enciso

Keyword(s):

Body Weight ◽

Statistical Model ◽

Family Structure ◽

Litopenaeus Vannamei ◽

Genetic Parameters ◽

Pacific White Shrimp ◽

White Shrimp ◽

The Pacific ◽

Estimation Of Genetic Parameters

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

Indian Journal of Fisheries ◽

10.21077/ijf.2016.63.3.49593-09 ◽

2016 ◽

Vol 63 (3) ◽

Cited By ~ 4

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.

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