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Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period
Dissertation MSc(Agric)--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_ | 1867613574526926848 |
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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 | © 2014 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)--University of Pretoria, 2014 |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/43564 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:18.923Z |
| 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:2263/43564 Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period Webb, E.C. (Edward Cottington) stefanie.steenkamp@gmail.com Steenekamp, Stefanie South African feedlot bulls Meat characteristics Feedlot cattle fed R-salbutamol Zilpaterol hydrochloride Finishing period UCTD Dissertation MSc(Agric)--University of Pretoria, 2014 In this study, 14 typical South African feedlot bulls received no beta-adrenergic agonist for the last 30 days of the finishing period (C), 14 received 120 mg R-salbutamol per animal per day for the last 30 days of the finishing period (S30), 13 received 120 mg Rsalbutamol per animal per day for the last 40 days of the finishing period (S40) and the last group of 13 bulls received 60 mg zilpaterol hydrochloride per animal per day for the last 30 days of the finishing period (Zh). All animals were slaughtered after a 3-day withdrawal period. Parameters included weight gain, feed intake, feed conversion rate, warm and cold carcass mass, dressing %, subcutaneous fat thickness, hide yield %, internal carcass fat distribution, % bone, % fat and % muscle of the prime rib-cut, carcass classification code, conformation, compactness, post-mortem carcass pH profiles, cooking loss, shear force, blood urea nitrogen, creatinine and residue levels of the beta-adrenergic agonists. No differences were observed between any of the four treatment groups concerning live feedlot performance. Bulls receiving the S30 and Zh treatments had lower internal carcass fat distribution compared to C bulls (P <0.05). Bulls receiving the S40 treatment had a lower % fat in the prime rib-cut compared to Zh bulls (P <0.05). Carcasses from S30 bulls had higher pH values 24 hours post mortem compared to carcasses from Zh bulls (P <0.01). Meat samples from Zh bulls had higher shear force, which indicates less tender meat, compared to samples from S40 bulls (P <0.05). Change in serum creatinine levels increased only in Zh treated bulls from the start to the end of treatment and may reflect a higher protein turnover in Zh bulls. The results of this study indicate that R-salbutamol has a more pronounced effect on fat metabolism in feedlot bulls compared to zilpaterol hydrochloride, while zilpaterol hydrochloride has a more pronounced effect on protein metabolism. The residue levels in samples of the liver, kidney, muscle and feaces from zilpaterol hydrochloride and R-salbutamol treated bulls were well below acceptable limits. gm2015 Animal and Wildlife Sciences MSc(Agric) Unrestricted 2015-02-06T06:01:41Z 2015-02-06T06:01:41Z 2014-09-04 2014 Dissertation Steenekamp, S 2014, Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period, MSc(Agric) Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/43564> M14/9/222/gm http://hdl.handle.net/2263/43564 en © 2014 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 | South African feedlot bulls Meat characteristics Feedlot cattle fed R-salbutamol Zilpaterol hydrochloride Finishing period UCTD Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title | Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title_full | Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title_fullStr | Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title_full_unstemmed | Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title_short | Growth performance and meat characteristics of feedlot cattle fed R-salbutamol or zilpaterol hydrochloride during the finishing period |
| title_sort | growth performance and meat characteristics of feedlot cattle fed r salbutamol or zilpaterol hydrochloride during the finishing period |
| topic | South African feedlot bulls Meat characteristics Feedlot cattle fed R-salbutamol Zilpaterol hydrochloride Finishing period UCTD |
| url | http://hdl.handle.net/2263/43564 |