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Effects of acid-binding capacity of South African feedstuffs and water pH on the performance of broilers
Dissertation (MSc Agric (Animal Science: Animal Nutrition))--University of Pretoria, 2020.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613652094287872 |
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| access_status_str | Open Access |
| author2 | Nkukwana, Thobela T. |
| author_browse | Nkukwana, Thobela T. |
| author_facet | Nkukwana, Thobela T. |
| 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 (Animal Science: Animal Nutrition))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/78602 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:32.610Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| 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:2263/78602 Effects of acid-binding capacity of South African feedstuffs and water pH on the performance of broilers Nkukwana, Thobela T. kyle@chemunique.co.za Plumstead, Peter Venter, Kyle M. UCTD Acid-binding capacity (ABC) South African feedstuffs Water pH Broiler performance Poultry production Gastrointestinal pH Digestive physiology Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-15 Dissertation (MSc Agric (Animal Science: Animal Nutrition))--University of Pretoria, 2020. Acid-Binding Capacity (ABC) is measured as the amount of acid required to drop the pH of 1 kg feed to pH 3 and pH 4. Each feed ingredient will therefore contribute to the ABC value of complete feed and has the potential to alter stomach pH by buffering the HCl secreted. Protein digestion begins with pepsin, which is secreted as the enzyme precursor pepsinogen, that requires a low gastric pH to be activated. The pepsin enzyme has been shown to have an optimum pH of 2. Therefore, feed ingredients or diets that raise the pH above a critical threshold have the potential to reduce protein digestibility. This can have a greater effect in young broilers due to their reduced ability to regulate their pH levels with reduced affinity for HCl secretion. This could potentially result in decreased performance and downstream gut health issues. Water alkalinity is essentially the buffering capacity of the water. This could potentially influence the pH of the gastrointestinal tract. The aim of this study is to create a survey for the pH and ABC values of all commonly used feed ingredients, in South Africa for the pH and ABC values. The study had a 2x2x2 factorial arrangement of treatments with two ABC values, two water alkalinity values and two water pHs with the aid of a water acidifier. The lower ABC value significantly (P<0.01) improved the feed conversion ratio (FCR), crude protein (CP) digestibility and dry matter (DM) digestibility. The use of a water acidifier did not have a significant (P<0.05) effect on any of the parameters measured. When birds consumed a diet with high ABC and a high-water alkalinity the CP digestibility in broiler chicks at 7 days of age significantly (P<0.05) decreased compared to birds fed a low ABC and a low alkalinity diet. The CP and DM digestibility was significantly (P<0.01) higher at day 21 compared to day 7. The pH of the gizzard and duodenum significantly (P<0.01) increased from day 7 to 21. The results from this study indicate that a low ABC diet improved performance and nutrient utilisation and should be incorporated into diet formulation and consideration for nutritionists to use in the future. bs2026 Animal and Wildlife Sciences MSc Agric (Animal Science: Animal Nutrition) Unrestricted SDG-02: Zero hunger SDG-12: Responsible consumption and production SDG-15: Life on land 2021-02-15T09:14:17Z 2021-02-15T09:14:17Z 2021-04 2020 Dissertation * A2021 http://hdl.handle.net/2263/78602 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 Acid-binding capacity (ABC) South African feedstuffs Water pH Broiler performance Poultry production Gastrointestinal pH Digestive physiology Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-15 Effects of acid-binding capacity of South African feedstuffs and water pH on the performance of broilers |
| title | Effects of acid-binding capacity of South African feedstuffs
and water pH on the performance of broilers |
| title_full | Effects of acid-binding capacity of South African feedstuffs
and water pH on the performance of broilers |
| title_fullStr | Effects of acid-binding capacity of South African feedstuffs
and water pH on the performance of broilers |
| title_full_unstemmed | Effects of acid-binding capacity of South African feedstuffs
and water pH on the performance of broilers |
| title_short | Effects of acid-binding capacity of South African feedstuffs
and water pH on the performance of broilers |
| title_sort | effects of acid binding capacity of south african feedstuffs and water ph on the performance of broilers |
| topic | UCTD Acid-binding capacity (ABC) South African feedstuffs Water pH Broiler performance Poultry production Gastrointestinal pH Digestive physiology Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-15 |
| url | http://hdl.handle.net/2263/78602 |