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Improving gut health and performance of broilers by adding Bacillus subtilis to the diet
Dissertation (MScAgric)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613641046491136 |
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| access_status_str | Open Access |
| author2 | Jansen van Rensburg, Christine |
| author_browse | Jansen van Rensburg, Christine |
| author_facet | Jansen van Rensburg, Christine |
| collection | Thesis |
| dc_rights_str_mv | © 2015 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 (MScAgric)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/50857 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:22.254Z |
| 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:2263/50857 Improving gut health and performance of broilers by adding Bacillus subtilis to the diet Jansen van Rensburg, Christine u28011164@tuks.co.za Plumstead, Peter Coertze, Gerhard UCTD Bacillus subtilis broiler chickens gut health probiotics immune response Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-08 Natural and agricultural sciences theses SDG-12 Dissertation (MScAgric)--University of Pretoria, 2015. The purpose of the study was to evaluate the benefits, if any, of adding a probiotic product containing Bacillus subtillus to the diet of broilers. The study was conducted in an open-sided house, with curtains and a coal boiler (HEATCO) attached to a heat sock. The house contained 64 pens in total, divided into 2 rows of 32 pens each over the length of the house. The pens were covered with used chicken litter (4cm deep). Three thousand six hundred Ross 308 broiler birds were feather-sexed and randomly distributed throughout the pens, 60 broilers of the same sex per pen at a stocking density of 20 birds/ m2. All broilers received similar typical South African maize-soya diets throughout the study. Diets were treated with antibiotic growth promoters (AGP) and / or direct-fed-microbials (DFM) to create six treatments as follows: Negative Control: Basal diet (without AGP), Positive Control: Basal diet (with AGP), DFM at 500g/ton (without AGP), DFM at 250g/ton (without AGP), DFM at 500g/ton (with AGP), and DFM at 250g/ton (with AGP). Broiler performance was measured weekly in terms of body weight (BW), feed intake (FI) and feed conversion ratio (FCR) from day old to 35 days of age. Birds were culled at day old, as well as 22 days of age for the isolation of Avian Pathogenic E. coli (APEC), E. coli and Lactobacillus from the gastrointestinal tract. Males showed a higher feed intake from 14 to 35 days of age compared to females, even though the FCR remained similar between sexes (P > 0.05). There were no dose response between DFM 500g/ton and DFM 250g/ton, as well as between DFM 500g/ton + AGP and DFM 250g/ton + AGP (P > 0.05) in terms of BW, FI and FCR. Positive Control had a higher body weight, no difference in feed intake and lower FCR compared to Negative Control at 35 days (P < 0.05). A lower dose of DFMs (250g/ton) in the diets of broilers revealed a significantly lower FCR compared to diets without DFMs (Negative Control), and DFM (500g/ton and 250g/ton) + AGP, and no significant difference in FCR compared to DFM (500g/tom) and Positive Control. However, when combining a DFM with AGP in the diet, the FCR of broilers increased due to a lower weight obtained with a higher feed intake at 35 days. The DFM (500g/ton) + AGP had a significantly lower BW compared to Positive Control at 35 days, although, revealed no significant difference in terms of FI (P > 0.05), but a significantly higher FCR at 35 days compared to Positive Control (P < 0.05). DFM (250g/ton) without AGP tend to lower the feed intake (P < 0.05) of broilers compared to AGPs, but when combining a DFM with AGP, the feed intake increased significantly (P < 0.05), revealing a higher FCR (P < 0.05) compared to AGPs and DFM (250g/ton). The recommendation will be to use a lower dose of DFM (250g/ton) as an alternative for AGP in broiler diets. tm2015 bs2026 Animal and Wildlife Sciences MScAgric Unrestricted SDG-02: Zero hunger SDG-08: Decent work and economic growth SDG-12: Responsible consumption and production 2015-11-25T09:53:59Z 2015-11-25T09:53:59Z 2015/09/01 2015 Dissertation Coertze, G 2015, Improving gut health and performance of broilers by adding Bacillus subtilis to the diet, MScAgric Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/50857> S2015 http://hdl.handle.net/2263/50857 en © 2015 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 Bacillus subtilis broiler chickens gut health probiotics immune response Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-08 Natural and agricultural sciences theses SDG-12 Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title | Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title_full | Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title_fullStr | Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title_full_unstemmed | Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title_short | Improving gut health and performance of broilers by adding Bacillus subtilis to the diet |
| title_sort | improving gut health and performance of broilers by adding bacillus subtilis to the diet |
| topic | UCTD Bacillus subtilis broiler chickens gut health probiotics immune response Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-08 Natural and agricultural sciences theses SDG-12 |
| url | http://hdl.handle.net/2263/50857 |