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Estimation of genetic parameters for reproductive traits in Mehraban sheep

Author

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  • R. Yavarifard

    (Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran)

  • N. Ghavi Hossein-Zadeh

    (Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran)

  • A.A. Shadparvar

    (Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran)

Abstract

Genetic parameters for basic and composite reproductive traits in Mehraban sheep were estimated. Data included 10 257 records on reproductive performances of 5813 lambs from 69 sires and 603 dams which were collected from 1994 to 2011 in the Mehraban breeding station in Hamedan province, western Iran. Studied traits were litter size at birth (LSB), litter size at weaning (LSW), litter mean weight per lamb born (LMWLB), litter mean weight per lamb weaned (LMWLW), total litter weight at birth (TLWB), and total litter weight at weaning (TLWW). Test of significance to include fixed effects in the statistical model was performed using the GLM procedure of SAS. Genetic parameters were estimated with univariate and bivariate repeatability animal models using WOMBAT program. Direct heritability estimates were 0.16, 0.14, 0.03, 0.16, 0.06, and 0.18 for LSB, LSW, LMWLB, LMWLW, TLWB, and TLWW, respectively, and corresponding repeatabilities were 0.02, 0.01, 0.73, 0.41, 0.27, and 0.03. The estimate for animal-dependent permanent environmental variance ranged from 0.01 ± 0.04 for LMWLW to 0.23 ± 0.04 for LSB. Genetic correlation estimates between traits ranged from -0.98 for LSB-LMWLW to 0.99 for LSB-TLWB. Phenotypic and environmental correlations were generally lower than genetic correlations. Phenotypic correlations ranged from -0.50 for LSB-LMWLB to 0.85 for LMWLW-TLWW. Environmental correlations ranged from -0.45 for LSB-LMWLB to 0.87 for LMWLW-TLWW. The results suggested that indirect selection based on TLWW could improve the reproductive performance in Mehraban ewes more effectively than if based on the other traits.

Suggested Citation

  • R. Yavarifard & N. Ghavi Hossein-Zadeh & A.A. Shadparvar, 2015. "Estimation of genetic parameters for reproductive traits in Mehraban sheep," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 60(6), pages 281-288.
    • Handle: RePEc:caa:jnlcjs:v:60:y:2015:i:6:id:8242-cjas
    DOI: 10.17221/8242-CJAS
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    References listed on IDEAS

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    1. H. Mohammadi & M. Moradi Shahrebabak & H. Moradi Sharebabak & M. Vatankhah, 2012. "Estimation of genetic parameters of reproductive traits in Zandi sheep using linear and threshold models," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 57(8), pages 382-388.
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    Cited by:

    1. Martin Ptáček & Jaromír Ducháček & Luděk Stádník & Milena Fantová, 2017. "Effects of age and nutritional status at mating on the reproductive and productive traits in Suffolk sheep kept under permanent outdoor management system," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 62(5), pages 211-218.

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