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Animal recording as a tool for improved genetic management in African beef cattle breeds
Dissertation (MScAgric)--University of Pretoria, 2014.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613648030007296 |
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| access_status_str | Open Access |
| author2 | Van Marle-Koster, Este |
| author_browse | Van Marle-Koster, Este |
| author_facet | Van Marle-Koster, Este |
| collection | Thesis |
| dc_rights_str_mv | © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MScAgric)--University of Pretoria, 2014. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/46030 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:29.036Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/46030 Animal recording as a tool for improved genetic management in African beef cattle breeds Van Marle-Koster, Este Theron, Helena Abin, Samuel Atanasio Mustafa UCTD EBVs Effective population size Genetic trend Inbreeding Pedigree Dissertation (MScAgric)--University of Pretoria, 2014. Population structure in five African beef cattle breeds in South Africa was investigated, to assess the effect of animal recording in management of genetic diversity and genetic improvement. Pedigree records of 247,173 Afrikaner, 57,561 Boran, 198,557 Drakensberger, 256,692 Nguni and 55,309 Tuli breed were analysed using the online POPREP software system. Pedigree completeness over six generations varied with the lowest completeness in the Boran and the highest in the Afrikaner.The average generation interval ranged between 6.0 to 6.4 years. The rates of inbreeding per year were 0.03%, 0.04%, 0.06%, 0.07% and 0.08% in Boran, Nguni, Afrikaner, Drakensberger and Tuli respectively. Effective population sizes were 89, 107, 122, 191 and 364 in Tuli, Afrikaner, Drakensberger, Nguni and Boran respectively. Inbreeding and effective population size for the Boran was not a true reflection due to poor pedigree recording. These results indicate that none of the breeds are in critical limits of endangerment. Breeding values were regressed on birth year of each breed for weight traits; Kleiber ratio and scrotal circumference from 1986 to 2012. Genetic trends were stable for birth weights except the Afrikaner and Tuli. Genetic progress has been made in weaning and post weaning weights for all the breeds except for limited progress in the Nguni. Kleiber ratio and scrotal circumference in all measured breeds have shown good progress. The results of this study confirmed that recording of pedigree and performance records are effective in maintenance of genetic diversity and genetic improvement through selection based on EBVs of recorded traits. tm2015 Animal and Wildlife Sciences MScAgric Unrestricted 2015-07-02T11:06:32Z 2015-07-02T11:06:32Z 2015/04/14 2014 Dissertation Abin, SA 2014, Animal recording as a tool for improved genetic management in African beef cattle breeds, MScAgric Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/46030> A2015 http://hdl.handle.net/2263/46030 en © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD EBVs Effective population size Genetic trend Inbreeding Pedigree Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title | Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title_full | Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title_fullStr | Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title_full_unstemmed | Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title_short | Animal recording as a tool for improved genetic management in African beef cattle breeds |
| title_sort | animal recording as a tool for improved genetic management in african beef cattle breeds |
| topic | UCTD EBVs Effective population size Genetic trend Inbreeding Pedigree |
| url | http://hdl.handle.net/2263/46030 |