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The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods
Dissertation (MSc (Agric) Animal Science: Animal Nutrition)--University of Pretoria, 2022.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613711130165248 |
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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 | © 2022 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, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/84620 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:28.830Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| 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:2263/84620 The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods Jansen van Rensburg, Christine garethwilks25@gmail.com Plumstead, Peter Wilks, Gareth Young broiler nutrition UCTD Phytase enzymes Broiler chickens Poultry nutrition Nutrient digestibility Sampling methods Growth performance Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 Dissertation (MSc (Agric) Animal Science: Animal Nutrition)--University of Pretoria, 2022. Phytases are supplemented to poultry diets to hydrolyse phytate, improve digestibility of P and thereby decrease P excretion and feed cost. It has been shown that the in vivo efficacy can differ between phytase sources, leading to differences in the slope and asymptote in the response in digestible P with increasing phytase dose. The objective of this study was to compare the effect of different statistical methods and sampling criterion on the efficacy of three phytase enzymes in young broiler diets on performance parameters (body weight (BW), body weight gain (BWG) and FCR) as well as bone mineralisation. A mash corn-soy based negative control diet was supplemented with each phytase product based on analysed phytase units (FTU) at the five dose levels (500, 1000, 1800, 2500 and 3500 FTU/kg) to form a dose response which was compared against three positive control (PC) diets that contained incremental amounts of monodicalcium phosphate. BW, BWG and FCRm were determined from 4-14 days. On day 14, eight broilers/cage were sampled, the right tibia removed, pooled by cage, and defatted tibia bone ash weight and content were determined. Bone ash, BW, BWG and FCRm were plotted against analysed phytase dose to compare the slope and asymptote parameter estimates in the nonlinear equation: y=a+b*cx. The results from this study suggest large differences in the in-vivo efficacy of newly developed phytases based on differences in the gradient and asymptote of the response in bone ash, BW, and FCRm. South African Society of Animal Science bs2026 Animal and Wildlife Sciences MSc (Agric) Animal Science: Animal Nutrition Unrestricted SDG-02: Zero hunger SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2022-03-24T10:20:09Z 2022-03-24T10:20:09Z 2022-07-15 2022 Dissertation Wilks, G 2022, The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods, MSc dissertation, University of Pretoria, Pretoria. S2022 http://hdl.handle.net/2263/84620 en © 2022 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 | Young broiler nutrition UCTD Phytase enzymes Broiler chickens Poultry nutrition Nutrient digestibility Sampling methods Growth performance Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title | The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title_full | The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title_fullStr | The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title_full_unstemmed | The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title_short | The comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| title_sort | comparative efficacy of novel phytase enzymes in young broiler diets through the use of different sampling and statistical methods |
| topic | Young broiler nutrition UCTD Phytase enzymes Broiler chickens Poultry nutrition Nutrient digestibility Sampling methods Growth performance Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 |
| url | http://hdl.handle.net/2263/84620 |