Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep
In this study, 14322 growth trait records of 2387 sheep bred and reared in the Rearing and Breeding Station of Bakhtiari Sheep during 1989-1997 were used to estimate the phenotypic, genetic, and environmental trends for some of the growth traits using Animal Model for lambs, rams, and ewes. The gene...
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| Format: | Article |
| Language: | fas |
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Isfahan University of Technology
2004-04-01
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| Series: | Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī |
| Subjects: | |
| Online Access: | http://jcpp.iut.ac.ir/article-1-409-en.html |
| _version_ | 1818273085333176320 |
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| author | M. Sargolzaei M. A. Edriss |
| author_facet | M. Sargolzaei M. A. Edriss |
| author_sort | M. Sargolzaei |
| collection | DOAJ |
| description | In this study, 14322 growth trait records of 2387 sheep bred and reared in the Rearing and Breeding Station of Bakhtiari Sheep during 1989-1997 were used to estimate the phenotypic, genetic, and environmental trends for some of the growth traits using Animal Model for lambs, rams, and ewes. The genetic trend of birth weight, weaning weight, six month's weight, daily gain from birth to weaning, daily gain from weaning to six month and daily gain from birth to six month were 12.2 (+2.9), 19.6 (+5.5), 28.7 (+8.7), .15(+0.04), 0.06 (+0.05) and 0.014 (+0.04) gr. for ewes as an indicator of genetic level of the herd respectively. Also, average of the genetic change rate per year for rams and lambs were calculated. Overall, the maximum progress rate was for six-month body weight (28.7 gr. per year) and the next was weaning weight (19.6 gr. per year). The results for lambs and rams also showed that these traits had the same rank for the genetic progress. The progress could be due to direct selection for these traits in the selection index criterion although there were negative phenotypic and environmental trends during the study years. Negative phenotypic and environmental trends could be due to bad environmental conditions, especially to nutrition of the sheep in an unsuitable (drought) climate during the study years. . |
| first_indexed | 2024-12-12T21:52:21Z |
| format | Article |
| id | doaj.art-48d9a1dddeda44d98505bd0e0fd38655 |
| institution | Directory Open Access Journal |
| issn | 2251-8517 |
| language | fas |
| last_indexed | 2024-12-12T21:52:21Z |
| publishDate | 2004-04-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī |
| spelling | doaj.art-48d9a1dddeda44d98505bd0e0fd386552022-12-22T00:10:45ZfasIsfahan University of TechnologyTulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī2251-85172004-04-0181125133Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari SheepM. Sargolzaei0M. A. Edriss1 In this study, 14322 growth trait records of 2387 sheep bred and reared in the Rearing and Breeding Station of Bakhtiari Sheep during 1989-1997 were used to estimate the phenotypic, genetic, and environmental trends for some of the growth traits using Animal Model for lambs, rams, and ewes. The genetic trend of birth weight, weaning weight, six month's weight, daily gain from birth to weaning, daily gain from weaning to six month and daily gain from birth to six month were 12.2 (+2.9), 19.6 (+5.5), 28.7 (+8.7), .15(+0.04), 0.06 (+0.05) and 0.014 (+0.04) gr. for ewes as an indicator of genetic level of the herd respectively. Also, average of the genetic change rate per year for rams and lambs were calculated. Overall, the maximum progress rate was for six-month body weight (28.7 gr. per year) and the next was weaning weight (19.6 gr. per year). The results for lambs and rams also showed that these traits had the same rank for the genetic progress. The progress could be due to direct selection for these traits in the selection index criterion although there were negative phenotypic and environmental trends during the study years. Negative phenotypic and environmental trends could be due to bad environmental conditions, especially to nutrition of the sheep in an unsuitable (drought) climate during the study years. .http://jcpp.iut.ac.ir/article-1-409-en.htmlgenetic trendgenetic progressbakhtiari sheepanimal model. |
| spellingShingle | M. Sargolzaei M. A. Edriss Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī genetic trend genetic progress bakhtiari sheep animal model. |
| title | Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep |
| title_full | Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep |
| title_fullStr | Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep |
| title_full_unstemmed | Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep |
| title_short | Estimation of Phenotypic, Genetic and Environmental Trends of Some of the Growth Traits in Bakhtiari Sheep |
| title_sort | estimation of phenotypic genetic and environmental trends of some of the growth traits in bakhtiari sheep |
| topic | genetic trend genetic progress bakhtiari sheep animal model. |
| url | http://jcpp.iut.ac.ir/article-1-409-en.html |
| work_keys_str_mv | AT msargolzaei estimationofphenotypicgeneticandenvironmentaltrendsofsomeofthegrowthtraitsinbakhtiarisheep AT maedriss estimationofphenotypicgeneticandenvironmentaltrendsofsomeofthegrowthtraitsinbakhtiarisheep |