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The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets
Dissertation (MSc (Agric))--University of Pretoria, 2019.
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University of Pretoria
2019
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| _version_ | 1867613504207323136 |
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| access_status_str | Open Access |
| author2 | Erasmus, L.J. (Lourens Jacobus) |
| author_browse | Erasmus, L.J. (Lourens Jacobus) |
| author_facet | Erasmus, L.J. (Lourens Jacobus) |
| collection | Thesis |
| dc_rights_str_mv | © 2019 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, 2019. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/72734 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:11.932Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| 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:2263/72734 The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets Erasmus, L.J. (Lourens Jacobus) u27223818@tuks.co.za Hagg, Francois Marius Gouws, Ruben UCTD Feedlot diet Antibiotic resistance mitigation Natural feed additives Buffers (Acid Buf) Plant extracts (Xtract 7035) Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-03 Natural and agricultural sciences theses SDG-12 Dissertation (MSc (Agric))--University of Pretoria, 2019. Ionophore antibiotic supplementation is standard practice in almost all feedlots in South Africa and many other countries due to its effectiveness in increasing feed efficiency and modulating feed intake. Public concern about the emergence of antibiotic resistant bacteria and consumers’ demand for safe, high quality nutritious food has stimulated the search for natural alternatives to ionophores in ruminant diets. A study was conducted to evaluate the effect of a buffer (calcified marine algae) and/or plant extract (capsicum) in combination with or replacing an ionophore on the performance of lambs in a commercial feedlot. A total of 2340 lambs were randomly allocated to six different treatments with six pens per treatment; with a pen as the experimental unit. Treatments were as follows: (1) Ionophore (18 ppm) (Monensin); (2) Calcified marine algae (5 kg/ton) (AB); (3) Capsicum (25 g/ton) (Caps); (4) AB (5 kg/ton) + Mon (18 ppm); (5) Caps (25 g/ton) + Mon (18 ppm); and (6) AB (5 kg/ton) + Caps (25 g/ton). All supplement concentrations were measured on an “as is” basis. Average starting weight of lambs was 30.9 kg ± 5 kg. The lambs were individually weighed on days 0, 10, 21, 35, 50, and at slaughter. All lambs were slaughtered at a pre-determined end weight of ± 48 kg. Average daily gain, dry matter intake, feed conversion ratio, cold carcass mass, dressing percentage, rumen fluid pH, and rumen scoring were among the parameters that were vii determined. The basal diets (starter, grower, and finisher) were the same for all treatments albeit with adjustments to the specific supplementation treatments. Days on feed were significantly longer for the AB + Caps treatment compared to the other treatments (P<0.001). Rumen pH values between day 1 and day 3 as well as days 13 and 30 were different between treatments (P<0.05). Other performance parameters measured did not differ between treatments. Results suggest that an ionophore such as monensin can be successfully replaced in lamb feedlot diets with natural alternatives (AB and/or Caps), with minor differences in production parameters (ADG, FCR, DMI, carcass weight and Dressing %). Further research, however, is needed to determine the potential adaptation of rumen microbial populations to the experimental treatments over time. Furthermore, the cost-benefit ratio should be determined under the prevailing conditions in different countries. bs2026 Animal and Wildlife Sciences MSc (Agric) Unrestricted SDG-02: Zero hunger SDG-03: Good health and well-being SDG-12: Responsible consumption and production 2019-12-13T08:07:54Z 2019-12-13T08:07:54Z 2019/09/05 2019 Dissertation Gouws, R 2019, The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets, MSc (Agric) Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/72734> S2019 http://hdl.handle.net/2263/72734 en © 2019 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 Feedlot diet Antibiotic resistance mitigation Natural feed additives Buffers (Acid Buf) Plant extracts (Xtract 7035) Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-03 Natural and agricultural sciences theses SDG-12 The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title | The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title_full | The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title_fullStr | The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title_full_unstemmed | The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title_short | The potential of buffers (Acid Buf) or plant extracts (Xtract 7035) as natural alternatives for ionophores in lamb feedlot diets |
| title_sort | potential of buffers acid buf or plant extracts xtract 7035 as natural alternatives for ionophores in lamb feedlot diets |
| topic | UCTD Feedlot diet Antibiotic resistance mitigation Natural feed additives Buffers (Acid Buf) Plant extracts (Xtract 7035) Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-03 Natural and agricultural sciences theses SDG-12 |
| url | http://hdl.handle.net/2263/72734 |