Genetic parameters for direct and maternal effects on growth traits of sheep

Ghafouri‐Kesbi, Farhad; Baneh, Hasan

doi:10.5194/aab-55-603-2012

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…In this research, six model different were compared for better fitting performance of WW, BW and PWDG traits in Afshari sheep. These results comparison of the models are in agreement with those reported byKhorsand et al (2014);Ghafouri-Kesbi and Baneh (2012).…”

supporting

confidence: 93%

Analysis of genetic parameters and genetic trends for early growth traits in Iranian Afshari sheep

Latifi

Mohammadi

2018

BIOTEC ANIM HUSB

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The purpose of the present study was estimation of genetic parameters and genetic trends of early growth traits using Bayesian approach by Gibbs3f90 software in Iranian Afshari sheep. The data set [birth weight (BW), weaning weight (WW) and pre-weaning daily weight gain (PWDG)] were collected during the period 1999 to 2010 from Agriculture Jahad of Zanjan province, Iran. The fitted fixed effects were herd-year-season as interactions, sex (male, female), birth type (single, multiple) and age of dam. Based on Derivative Information Criteria (DIC), for studied traits the most appropriate model was determined. Therefore, based on the most appropriate fitted model, the direct additive heritabilities estimate for BW, WW and PWDG were 0.32±0.02, 0.05±0.01 and 0.24±0.02, respectively. The estimates of maternal heritabilities were 0.17±0.04, 0.07±0.02 and 0.12±0.05 and total heritabilities 0.11±0.05, 0.08±0.02 and 0.08±0.03 for BW, WW and PWDG, respectively. Direct genetic trends were positive for all traits but only significant for BW 0.75±0.31 g/year (P <0.05). Also, maternal genetic trends were for all traits negative and was significant for BW-0.63±0.27 g/year (P <0.05). The moderate estimates of heritabilities for early growth traits indicate that in Afshari sheep faster genetic improvement through selection is possible for these traits. Furthermore, the results genetic trends in this current study indicated that genetic improvement through selection is suitable only for BW in Afshari sheep.

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supporting

confidence: 93%

Analysis of genetic parameters and genetic trends for early growth traits in Iranian Afshari sheep

Latifi

Mohammadi

2018

BIOTEC ANIM HUSB

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“…The Makuie sheep population in Iran is a total of approximately three million heads distributed mainly in Azerbaijan Province. Also, in Turkey country, this sheep is known as White Karaman (GHAFOURI-KESBI, 2012). It is a medium-sized and fat-tailed sheep that is adapted to cold and highland environments conditions and raised for mutton, producing milk and wool.…”

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confidence: 99%

Estimation of genetic parameters of autosomal and sex-linked pre-weaning traits in Makuie sheep using multivariate analysis

Latifi¹,

Mohammadi²

2019

Genetika

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The objective of this study was to determine the genetic parameters of autosomal and sexlinked effects for birth weight (BW), weaning weight (WW), average daily gain from birth to weaning (ADG) and kleiber ratio (KR) of Makuie sheep. The data set used in this study was collected at Makuie sheep breeding station in West Azerbaijan province, Iran, between 1994 and 2011. The fixed effects included herd-year, sex (male or female), birth type (single or twin), and age of dam (five classes, 2-6 years old). The three multivariate linear animal models including direct (autosomal and sex-linked) and maternal effects were used to analyze data. The 2 nd model (including direct additive genetic effects of animal (autosomal and sex-linked) and permanent environmental effects), with the lowest AIC value was considered as the most appropriate model. Based on the most appropriate fitted model, direct autosomal and sex-linked heritabilities of BW, WW, ADG and KR were 0.12±0.

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“…Estudos realizados com diferentes raças de ovinos, usando diferentes modelos, mostram que, de maneira geral, pesos ao nascer e à desmama apresentam correlação genética de magnitudes variando de moderadas a altas 1,[21][22][23][24][25] . Estes resultados mostram que a seleção para o aumento no peso em determinada idade pode resultar no progresso genético de pesos subsequentes 26 . Da mesma maneira, a correlação genética entre os efeitos maternos das características estudadas foi positiva e de magnitude moderada, porém com erro-padrão elevado (0,32±0,17).…”

Section: Resultsunclassified

Estimativas de parâmetros genéticos para características de crescimento de cordeiros mestiços Suffolk

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RESUMOObjetivou-se estimar os coeficientes de herdabilidade e correlação genética entre os pesos ao nascer (PN) e à desmama (PD) de cordeiros mestiços Suffolk, pertencentes a rebanho experimental. Assim, foram testados quatro modelos, os quais consideraram o efeito genético aditivo direto (Modelo 1), os efeitos genético direto e de ambiente permanente materno (Modelo 2), os efeitos aditivo direto, de ambiente permanente e genético materno (cov a,m =0) (Modelo 3), e no Modelo 4, além daqueles contemplados no Modelo 3, foi considerada cov a,m ≠0. Após comparar os modelos por meio do teste de razão de verossimilhança (LRT), observou-se que o 3 foi o mais adequado, sendo que as estimativas de herdabilidade foram de baixa magnitude para PN e PD, iguais a 0,08±0,009 e 0,24±0,17, respectivamente, indicando pequena possibilidade de resposta à seleção direta. Da mesma maneira, o coeficiente de correlação genética entre estas características foi 0,43±0,39, resultado que implica pequena possibilidade de resposta correlacionada. A inclusão dos efeitos maternos é necessária para a estimação adequada de parâmetros genéticos para as características avaliadas. PALAVRAS-CHAVE: comparação de modelos; correlação genética; herdabilidade; peso corporal. ESTIMATES OF GENETIC PARAMETERS FOR GROWTH TRAITS IN SUFFOLK CROSSBRED LAMBS ABSTRACTThe aim of this study was to estimate the heritability and genetic correlation coefficients between weights at birth (BW) and weaning (WW) in Suffolk crossbred lambs, which belonged to an experimental herd. Thus, four different animal models were fitted, including the direct additive genetic effect (Model 1), the direct additive genetic and maternal permanent environmental effects (Model 2), the direct additive, permanent environmental and maternal genetic effects (cov a,m =0) (Model 3), and in Model 4, in addition to those in Model 3, cov a,m ≠0 was considered. After comparing the models through the likelihood ratio test (LRT), Model 3 was chosen as the most appropriate, being the heritability estimates low in magnitude for BW and WW, equal to 0.08±0.009 and 0.24±0.17, respectively, which indicates low possibility of response to direct selection. Likewise, the correlation coefficient between these traits, 0.43±0.39, implies low possibility of correlated response. The inclusion of maternal effects is necessary for the accurate estimation of genetic parameters for the evaluated traits.

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Genetic parameters for direct and maternal effects on growth traits of sheep

Cited by 9 publications

References 18 publications

Analysis of genetic parameters and genetic trends for early growth traits in Iranian Afshari sheep

Analysis of genetic parameters and genetic trends for early growth traits in Iranian Afshari sheep

Estimation of genetic parameters of autosomal and sex-linked pre-weaning traits in Makuie sheep using multivariate analysis

Estimativas de parâmetros genéticos para características de crescimento de cordeiros mestiços Suffolk

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