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Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs
Dissertation (MSc Agric (Animal Science))--University of Pretoria, 2024.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2024
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| _version_ | 1867613636259741696 |
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| access_status_str | Open Access |
| author2 | Webb, E.C. (Edward Cottington) |
| author_browse | Webb, E.C. (Edward Cottington) |
| author_facet | Webb, E.C. (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))--University of Pretoria, 2024. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/97244 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:17.781Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| 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:2263/97244 Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs Webb, E.C. (Edward Cottington) naomilupton7@gmail.com Lupton, Naomi UCTD Pig slaughter CO2-stunning Electrical stunning Muscle metabolism Stress Dissertation (MSc Agric (Animal Science))--University of Pretoria, 2024. The purpose of this research was to study the effects of different stunning systems on the welfare of pigs in South African abattoirs. Four stunning systems were evaluated: 84% CO2, emergency head-only electrical, standard head-to-heart electrical, and an experimental 80% Argon 20% CO2 (Ar-CO2) admixture. pH data, pig behaviour inside the stunner and muscle metabolites were studied in this research. Both the Ar-CO2 and emergency head-only stunning methods were deemed problematic on the basis of animal welfare. The Ar-CO2 method had the sharpest and fastest pH decline. The 84% CO2 and standard electrical head-to-heart stunning methods had similar rates of pH decline, with CO2 having a lower pH than electrical stunning at every point. The behaviour displayed during gas stunning treatments was recorded by way of cameras located inside the stunner. Those stunned by 84% CO2 lost their consciousness significantly faster than those stunned by Ar-CO2. During the Ar-CO2 stunning, four out of five pigs squealed while under the admixture’s influence, indicating that the animals were distressed during this process. Squeals were not heard while the pigs were exposed to the 84% CO2. pH profiles did not differ significantly between head-to-heart electrical stunning and 84% CO2 stunning, implying that the stunning treatment itself did not have a big effect on the post mortem pH and its decline. The author recommends that further research in the South African pork industry be focused on improving and refining current CO2- and electrical stunning systems. Pre-slaughter handling plays a big role in the animal’s psychological- and physiological state during stunning and must be further improved upon. Red Meat Abattoir Association Animal and Wildlife Sciences MSc Agric (Animal Science) Unrestricted Faculty of Natural and Agricultural Sciences SDG-12: Responsible consumption and production 2024-07-25T09:33:59Z 2024-07-25T09:33:59Z 2024-09 2024-07-24 Dissertation Lupton, N. 2024. Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs, MSc Agric (Animal Science) dissertation, Department of Animal Science, University of Pretoria. S2024 http://hdl.handle.net/2263/97244 Data available of request. (See file attached). 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 Pig slaughter CO2-stunning Electrical stunning Muscle metabolism Stress Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title | Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title_full | Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title_fullStr | Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title_full_unstemmed | Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title_short | Effects of different stunning methods on the welfare and carcass quality of finisher pigs in South African pork abattoirs |
| title_sort | effects of different stunning methods on the welfare and carcass quality of finisher pigs in south african pork abattoirs |
| topic | UCTD Pig slaughter CO2-stunning Electrical stunning Muscle metabolism Stress |
| url | http://hdl.handle.net/2263/97244 |