Estimation of genetic parameters for reproductive traits in Mehraban sheep
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 Ira...
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| Format: | Article |
| Language: | English |
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Czech Academy of Agricultural Sciences
2015-06-01
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| Series: | Czech Journal of Animal Science |
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| Online Access: | https://cjas.agriculturejournals.cz/artkey/cjs-201506-0006_estimation-of-genetic-parameters-for-reproductive-traits-in-mehraban-sheep.php |
| _version_ | 1797899177038970880 |
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| author | R. Yavarifard N. Ghavi Hossein-Zadeh A.A. Shadparvar |
| author_facet | R. Yavarifard N. Ghavi Hossein-Zadeh A.A. Shadparvar |
| author_sort | R. Yavarifard |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T08:25:52Z |
| format | Article |
| id | doaj.art-2bd00772d1c541b185946e54f6b09b59 |
| institution | Directory Open Access Journal |
| issn | 1212-1819 1805-9309 |
| language | English |
| last_indexed | 2024-04-10T08:25:52Z |
| publishDate | 2015-06-01 |
| publisher | Czech Academy of Agricultural Sciences |
| record_format | Article |
| series | Czech Journal of Animal Science |
| spelling | doaj.art-2bd00772d1c541b185946e54f6b09b592023-02-23T03:33:18ZengCzech Academy of Agricultural SciencesCzech Journal of Animal Science1212-18191805-93092015-06-0160628128810.17221/8242-CJAScjs-201506-0006Estimation of genetic parameters for reproductive traits in Mehraban sheepR. Yavarifard0N. Ghavi Hossein-Zadeh1A.A. Shadparvar2Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, IranDepartment of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, IranDepartment of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, IranGenetic 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.https://cjas.agriculturejournals.cz/artkey/cjs-201506-0006_estimation-of-genetic-parameters-for-reproductive-traits-in-mehraban-sheep.phpheritabilitygenetic correlationlitter sizefat-tailed sheep |
| spellingShingle | R. Yavarifard N. Ghavi Hossein-Zadeh A.A. Shadparvar Estimation of genetic parameters for reproductive traits in Mehraban sheep Czech Journal of Animal Science heritability genetic correlation litter size fat-tailed sheep |
| title | Estimation of genetic parameters for reproductive traits in Mehraban sheep |
| title_full | Estimation of genetic parameters for reproductive traits in Mehraban sheep |
| title_fullStr | Estimation of genetic parameters for reproductive traits in Mehraban sheep |
| title_full_unstemmed | Estimation of genetic parameters for reproductive traits in Mehraban sheep |
| title_short | Estimation of genetic parameters for reproductive traits in Mehraban sheep |
| title_sort | estimation of genetic parameters for reproductive traits in mehraban sheep |
| topic | heritability genetic correlation litter size fat-tailed sheep |
| url | https://cjas.agriculturejournals.cz/artkey/cjs-201506-0006_estimation-of-genetic-parameters-for-reproductive-traits-in-mehraban-sheep.php |
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