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Parental imprinting effects on growth traits and Kleiber ratio in sheep

Published online by Cambridge University Press:  02 May 2022

F. Ghafouri-Kesbi Open the ORCID record for F. Ghafouri-Kesbi [Opens in a new window] ,
M. Mokhtari Open the ORCID record for M. Mokhtari [Opens in a new window] ,
M. Gholizadeh Open the ORCID record for M. Gholizadeh [Opens in a new window] ,
M. Amiri Roudbar  and
M. A. Abbasi
F. Ghafouri-Kesbi*
Affiliation:
Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
M. Mokhtari
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Jiroft, P.O. Box 364, Jiroft, Iran
M. Gholizadeh
Affiliation:
Department of Animal Science, Faculty of Animal and Aquatic Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
M. Amiri Roudbar
Affiliation:
Department of Animal Science, Safiabad-Dezful Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education & Extension Organization (AREEO), Dezful, 333, Iran
M. A. Abbasi
Affiliation:
Animal Science Research Institute of Iran (ASRI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
*
Author for correspondence: F. Ghafouri-Kesbi, E-mail: [email protected]; [email protected]
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Abstract

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.

Keywords

Body weightgenetic correlationgrowthheritabilitymaternal effects
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 160 , Issue 3-4 , June 2022 , pp. 260 - 269
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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