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Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers
Thesis (PhD)--University of Pretoria, 2012.
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University of Pretoria
2013
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| _version_ | 1867613669859262464 |
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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 | © 2011 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 | Thesis (PhD)--University of Pretoria, 2012. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/25168 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:49.883Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/25168 Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers Webb, E.C. (Edward Cottington) Strydom, P.E. (Phillip Evert) phoeka80@yahoo.com Hope-Jones, Michelle Meat quality Beta-agonist treatment UCTD Thesis (PhD)--University of Pretoria, 2012. In this study, 20 young steers received no beta-adrenergic agonist (C), 100 animals all received zilpaterol hydrochloride, with 1 group only receiving zilpaterol (Z) while the other 4 groups received zilpaterol and vitamin D3 at the following levels and durations before slaughter: 7 million IU Vit D3 /animal/day for 3 days (3D7M); 7 million IU Vit D3/animal/day for 6 days (6D7M); 7 million IU Vit D3/animal/day for six days with 7 days no supplementation (6D7M7N) and 1 million IU Vit D3/animal/day for 9 days (9D1M). Left carcass sides were electrically stimulated (ES) and the right side not electrically stimulated (NES). Samples were aged for 3 or 14 days post mortem. Parameters included Warner Bratzler shear force (WBSF), myofibril filament length (MFL), sarcomere length and calpastatin and calpain enzyme activities. For drip loss and instrumental colour measurements, samples were analysed fresh (1 day post mortem) or vacuum-aged for 14 days post mortem. Both ES-treatment and prolonged aging reduced WBSF (P < 0.001). Treatments 6D7M, 6D7M7N and Z remained significantly tougher than C (P < 0.001), while 3D7M and 9D1M improved WBSF under NES conditions. ES was shown to be more effective at alleviating beta-adrenergic agonist induced toughness than high vitamin D3 supplementation. Aging increased drip loss, lightness, redness and yellowness while ES increased drip loss. In general, Z showed increased drip loss, lighter meat, and reduced redness. Vitamin D3 supplementation could not consistently overcome the adverse effects of zilpaterol hydrochloride in feedlot steers. Animal and Wildlife Sciences unrestricted 2013-09-06T19:43:15Z 2012-06-06 2013-09-06T19:43:15Z 2012-04-19 2012-06-06 2012-05-31 Thesis Hope-Jones, M 2011, Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/25168 > D12/4/458/ag http://hdl.handle.net/2263/25168 http://upetd.up.ac.za/thesis/available/etd-05312012-014508/ © 2011 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 application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Meat quality Beta-agonist treatment UCTD Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title | Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title_full | Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title_fullStr | Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title_full_unstemmed | Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title_short | Effects of dietary beta-agonist treatment, Vitamin D3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| title_sort | effects of dietary beta agonist treatment vitamin d3 supplementation and electrical stimulation of carcasses on meat quality of feedlot steers |
| topic | Meat quality Beta-agonist treatment UCTD |
| url | http://hdl.handle.net/2263/25168 http://upetd.up.ac.za/thesis/available/etd-05312012-014508/ |