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Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems
Dissertation (MSc (Agric) Animal Science (Production Physiology and Product Quality))--University of Pretoria, 2024.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2025
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| _version_ | 1867613667182247936 |
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| access_status_str | Open Access |
| author2 | Webb, Edward Cottington |
| author_browse | Webb, Edward Cottington |
| author_facet | Webb, Edward Cottington |
| collection | Thesis |
| dc_rights_str_mv | © 2023 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 (MSc (Agric) Animal Science (Production Physiology and Product Quality))--University of Pretoria, 2024. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/101028 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:47.098Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| 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:2263/101028 Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems Webb, Edward Cottington elandie888@gmail.com Du Preez, Elandie UCTD Sustainable Development Goals (SDGs) Double muscling Droughtmaster South Africa (SA) Feed efficiency Multiple ovulation and embryo transfer Residual feed intake Dissertation (MSc (Agric) Animal Science (Production Physiology and Product Quality))--University of Pretoria, 2024. Feed is one of the major expenses in the beef industry, so it is beneficial to select animals that consume less feed for the same level of production. This study aimed to compare the feed efficiency and residual feed intake of Droughtmaster SA weaners of different double muscling genotypes (F94L and NT821) produced by multiple ovulation embryo transfer (MOET) between the GrowSafe system and veld. In this study, several feed efficiency measures were recorded from 150 Droughtmaster SA bulls and heifers over two years. Primary data obtained for evaluation showed that there was a positive association between the double muscling mutations and low residual feed intake (efficient animal). Sex (male and female), residual feed intake rank, double muscling mutation (F94L, NT821, None), and other efficiency variables were analysed using the General Linear Model using the SPSS Software (Version 29). The results confirmed that variations in residual feed intake do exist. The research also suggested that the ranking of efficient animals in the GrowSafe system and on veld remained the same. The results of the study validated that the GrowSafe system can identify the same bulls and heifers with low RFI as on veld, which indicated that the performance testing period can be significantly reduced and cattle can be marketed at an increased price in a shorter time frame. There was no significant difference in efficiency parameter ranking of weaners in the intensive feeding system (GrowSafe System) versus on veld, as well as no significant difference between efficiency parameter measures of different double muscling genotypes when the entire population of cattle were accounted for. Significant differences did exist between efficiency parameter measures of different double muscling genotypes within gender groups. Subsequently, this may lead to decreased reproductive efficiency, since Droughtmaster SA cattle are an early maturing breed. The results of this study may have a practical implication on breeding goals, since selecting more feed-efficient animals may result in less efficient animals in terms of reproduction. Animal and Wildlife Sciences MSc (Agric) Animal Science (Production Physiology and Product Quality) Unrestricted Faculty of Natural and Agricultural Sciences None 2025-02-18T14:31:47Z 2025-02-18T14:31:47Z 2025-04 2024 Dissertation * A2025 http://hdl.handle.net/2263/101028 10.25403/UPresearchdata.28435697 en © 2023 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 Sustainable Development Goals (SDGs) Double muscling Droughtmaster South Africa (SA) Feed efficiency Multiple ovulation and embryo transfer Residual feed intake Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title | Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title_full | Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title_fullStr | Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title_full_unstemmed | Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title_short | Analyses of the variation in feed efficiency measures of MOET-produced Droughtmaster SA cattle in intensive and extensive feeding systems |
| title_sort | analyses of the variation in feed efficiency measures of moet produced droughtmaster sa cattle in intensive and extensive feeding systems |
| topic | UCTD Sustainable Development Goals (SDGs) Double muscling Droughtmaster South Africa (SA) Feed efficiency Multiple ovulation and embryo transfer Residual feed intake |
| url | http://hdl.handle.net/2263/101028 |