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Quantifying parent-of-origin variation in growth and reproductive traits of Kermani sheep

Published online by Cambridge University Press:  18 July 2022

Morteza Mokhtari Open the ORCID record for Morteza Mokhtari [Opens in a new window] ,
Arsalan Barazandeh Open the ORCID record for Arsalan Barazandeh [Opens in a new window] ,
Zahra Roudbari ,
Farhad Ghafouri-Kesbi Open the ORCID record for Farhad Ghafouri-Kesbi [Opens in a new window]  and
Mahmoud Amiri Roudbar
Morteza Mokhtari*
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Jiroft, P.O. Box 364, Jiroft, Iran
Arsalan Barazandeh
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Jiroft, P.O. Box 364, Jiroft, Iran
Zahra Roudbari
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Jiroft, P.O. Box 364, Jiroft, Iran
Farhad Ghafouri-Kesbi
Affiliation:
Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Mahmoud 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
*
Author for correspondence: Morteza Mokhtari, E-mail: msmokhtari@ujiroft.ac.ir
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Abstract

Records on growth and reproductive characteristics collected from 1993 to 2013 at the Breeding Station of Kermani sheep, south-east of Iran, were used for estimating genetic parameters related to parent-of-origin effects. The studied growth traits were birth weight (BWT), weaning weight (WWT), six-month weight (6MW), average daily gain from birth to weaning (ADG1), and average daily gain from weaning to six months of age (ADG2). The reproductive traits were litter size at birth per ewe lambing (LSB), litter size at weaning per ewe lambing (LSW), the sum of litter weight at birth per ewe lambing (LWB), and the sum of litter weight at weaning per ewe lambing (LWW). Models with and without imprinting (maternal and paternal) effects were compared by applying Akaike's information criterion (AIC). Maternal imprinting effects explained 14, 7, 24 and 5% of the phenotypic variances for BWT, WWT, 6MW and ADG1, respectively and their inclusion in the model decreased direct heritability estimates for BWT (from 0.07 to 0.05), WWT (from 0.29 to 0.23), 6MW (from 0.26 to 0.12) and ADG1 (from 0.20 to 0.17). Imprinting effects did not affect ADG2 and studied reproductive traits. The results indicated that a considerable proportion of the maternal imprinting effects overlap with direct additive genetic and maternal effects. Therefore, imprinting effects may be crucial for the genetic assessment of BWT, WWT, 6MW and ADG1 in Kermani sheep.

Keywords

Body weightimprinting effectslambsreproductionvariance components
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 160 , Issue 5 , October 2022 , pp. 391 - 396
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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