Estimates of variance components due to parent-of-origin effects for body weight in Iran-Black sheep

Roudbar, Mahmoud Amiri; Mohammadabadi, Mohammadreza; Mehrgardi, Ahmad Ayatollahi; Abdollahi-Arpanahi, Rostam

doi:10.1016/j.smallrumres.2017.01.002

Cited by 43 publications

(37 citation statements)

References 16 publications

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“…Decrease in direct and maternal additive genetic variances as observed here was in agreement with other reports, including Meyer and Tier (2012), Tier and Meyer (2012) and Amiri Roudbar et al (2017). For example, in a study by Amiri Roudbar et al (2017), when the maternal imprinting effect was added to the model, estimates of d 2 a decreased by 21, 26 and 14% for BW, WW and W6, respectively.…”

Section: Discussionsupporting

confidence: 92%

“…Our study showed that, especially for growth traits of sheep, imprinting effects are important sources of phenotypic variation. Amiri Roudbar et al (2017), who worked on Iran-Black sheep, reported estimates of maternal imprinting heritability for weaning weight and 6 months weight as 0.22 and 0.21, respectively. In addition, in Lori-Bakhtiari sheep, Amiri Roudbar et al (2018) estimated maternal imprinting heritability for birth weight, weaning weight, 9 months weight and pre-and postweaning growth rates as 0.23, 0.10, 0.13, 0.16 and 0.05, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, by developing suitable computer software such as WOMBAT (Meyer, 2020), estimating imprinting effects in livestock has attracted lots of attention. By considering imprinting from both parents, the importance of imprinting effects on performance traits of pigs, beef cattle, sheep and chicken has been studied by Neugebauer et al (2010), Meyer and Tier (2012), Amiri Roudbar et al (2017) and Karami et al (2019), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…According to the geneimprint website (https://www.geneimprint.com), there are 17 maternal and 14 paternal imprinted genes in sheep, of which some genes have been shown that affect growth and reproduction traits (Davis et al, 2001;Tellam et al, 2012). Despite this, little effort has been made to quantify imprinting effects on the growth traits of sheep (Amiri Roudbar et al, 2017Roudbar et al, , 2018. In addition, for efficiency-related traits such as the Kleiber ratio (Kleiber, 1947), there are no previous reports regarding imprinting effects.…”

Section: Introductionmentioning

confidence: 99%

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Parental imprinting effects on growth traits and Kleiber ratio in sheep

et al. 2022

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The goal was to study imprinting effects on birth weight (BW), weaning weight (WW), six months weight (W6), pre- and post-weaning growth rate (GRa and GRb), and pre- and post-weaning Kleiber ratio (KRa and KRb) in Baluchi and Makuie sheep breeds. Analyses were done in a two steps process. In the first step, each trait was analysed with a series of 12 univariate animal models, including different combinations of direct and maternal effects and the best model was selected by the AIC criterion. In the second step, three new models were fitted by adding either maternal imprinting effect, paternal imprinting effect, or both of them, respectively, to the best model already selected in the first step, and changes in AIC were monitored. (Co)variances between traits were estimated using bivariate analyses. In Baluchi sheep, for BW, WW and W6, estimates of maternal imprinting heritability ( ${\boldsymbol h}_{{\boldsymbol mi}}^2$ ) were 0.12 ± 0.02, 0.08 ± 0.01 and 0.09 ± 0.01, respectively. In Makuie sheep, paternal imprinting heritability ( ${\boldsymbol h}_{{\boldsymbol pi}}^2$ ) for BW, WW, W6, GRb and KRb were 0.17 ± 0.05, 0.8 ± 0.05, 0.38 ± 0.10, 0.71 ± 0.15 and 0.65 ± 0.13, respectively. In Baluchi sheep, strong maternal imprinting correlations were observed between BW and WW (0.93 ± 0.05), BW and W6 (0.80 ± 0.07) and WW and W6 (0.91 ± 0.02). In Makuie sheep, paternal imprinting correlations ranged from −0.97 ± 0.33 (BW-GRb) to 0.99 ± 0.47 (GRb-KRb). It was concluded that imprinting effects need to be included in the statistical model to increase the accuracy of genetic evaluation. However, to have accurate and reliable estimates of imprinting effects, the availability of large data sets and deep pedigrees are necessary.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parental imprinting effects on growth traits and Kleiber ratio in sheep

et al. 2022

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“…Thus, combined trials with emphasis on administration and genetic progress to improve animal outputs are of decisive significance ( Masoudzadeh et al., 2020b ; Mohammadabadi et al., 2017 ). Economical and biological efficiency of sheep production enterprises generally improves by increasing productivity and reproductive performance of ewes ( Mohammadabadi 2016 ; Amiri Roudbar et al., 2017 , 2018 ; Ghotbaldini et al., 2019 ; Mohammadabadi et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Analysis of genetic parameters and genetic trends for early growth and reproductive traits of Doyogena sheep managed under community-based breeding program

Habtegiorgis¹,

Haile²,

Getachew³

et al. 2022

Heliyon

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Meta‐analysis of genetic parameters for growth traits in meat, wool and dual‐purpose sheep breeds in the world using a random‐effects model

Abasi‐Mousa

Varkoohi

Joezy

et al. 2022

Veterinary Medicine & Sci

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Background There is large variation in genetic parameters in literature for growth traits in sheep. Reliable estimation of genetic parameters is required for developing breeding programmes. Objectives The aim of this study was to aggregate results of different studies by meta‐analysis to improve reliability of estimated parameters. Methods In the current study, 221 papers that have been published between 1995 and 2021 were reviewed. Using a random‐effects model in the Comprehensive Meta‐Analysis software, direct and maternal heritabilities, as well as, genetic and phenotypic correlations between growth traits were estimated in meat (M), wool (W) and dual‐purpose (D) sheep breeds. The growth traits in this study were birth weight, 3‐month weight, 6‐month weight, 9‐month weight and yearling weight. Results The combined direct heritability was the lowest for birth weight (0.190 ± 0.004, 0.198 ± 0.003 and 0.196 ± 0.004 for M, W and D breeds, respectively) and the highest for yearling weight (0.264 ± 0.010, 0.304 ± 0.005 and 0.285 ± 0.020 for M, W and D breeds, respectively). The maternal heritability was the lowest for yearling weight (0.085 ± 0.003, 0.055 ± 0.002 and 0.052 ± 0.005 for M, W and D breeds, respectively) and the highest for 6‐month weight (0.240 ± 0.088, 0.164 ± 0.001 and 0.162 ± 0.006 for M, W and D breeds, respectively). The phenotypic and genetic correlations were lower between the weights measured at more distant intervals. The lowest genetic correlation was observed between birth weight and yearling weight (0.290 ± 0.051 for W breeds). Conclusions The small standard errors could indicate that the aggregation of results from different studies improved the reliability of estimated parameters and reduced range of 95% confidence intervals. Hence, the results could be used with greater level of confidence in sheep breeding programmes.

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Estimates of variance components due to parent-of-origin effects for body weight in Iran-Black sheep

Cited by 43 publications

References 16 publications

Parental imprinting effects on growth traits and Kleiber ratio in sheep

Parental imprinting effects on growth traits and Kleiber ratio in sheep

Analysis of genetic parameters and genetic trends for early growth and reproductive traits of Doyogena sheep managed under community-based breeding program

Meta‐analysis of genetic parameters for growth traits in meat, wool and dual‐purpose sheep breeds in the world using a random‐effects model

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