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Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase
Dissertation (MScAgric (Animal Science Animal Nutrition))--University of Pretoria, 2023.
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University of Pretoria
2023
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| _version_ | 1867613684841316352 |
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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 | © 2023 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 (Animal Science Animal Nutrition))--University of Pretoria, 2023. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/91424 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:03.959Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| 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:2263/91424 Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase Jansen van Rensburg, Christine gerhard.claassen@yahoo.com Plumstead, Peter Claassen, Gerhardus Calcium Broilers Vitamin D Phytase 1α-Hydroxycholecalciferol Digestibility UCTD Dissertation (MScAgric (Animal Science Animal Nutrition))--University of Pretoria, 2023. 1α-Hydroxycholecalciferol (1α-OH-D3) is a synthetic cholecalciferol derivative that is rapidly hydroxylated into 1α,25-dihydroxycholecalciferol, the biologically active form of cholecalciferol. 1α,25-Dihydroxycholecalciferol plays a critical role in several biological processes and is important for the regulation of several genes involved in calcium (Ca) and phosphorus (P) absorption. Phytase is an enzyme that hydrolyses phytate and improves the digestibility of Ca and P in the small intestine. The objective of this study was to establish the effects of 1α-OH-D3 in combination with phytase on apparent ileal digestibility (AID) of Ca and AID P. To achieve this a digestibility trial was conducted on broilers at two different ages, days 10 and 23 (D10 and D23), respectively. Treatments were arranged in a 3 × 3 factorial with three 1α-OH-D3 doses (0, 2.5 and 5 µg 1α-OH-D3/kg feed) × three phytase doses (0, 500, 1000 FTU phytase/kg feed). Treatment diets were prepared by adding 0, 2.5 or 5 µg 1α-OH-D3/kg and/or a 6-phytase, which is a novel consensus bacterial 6-phytase variant, expressed in Trichoderma reesei, at 0, 500 or 1000 FTU phytase/kg feed. Each treatment was replicated 11 times on both D10 and D23 with 8 birds/replicate for D10 and 6 birds/replicate for D23. On the respective sampling days, ileal digesta was collected, frozen, freeze-dried and ground to pass through a 0.25mm screen before being analysed for dry matter, Ca, P, and titanium. The data was analysed with a full factorial using the JMP 16.0 statistical package where block was included as a random effect and means were separated using a protected Tukey HSD test at P<0.05. Both 1α-OH-D3 and phytase improved AID Ca, AID P, digestible Ca (dCa) and digestible P (dP). There was no difference in birds that were fed diets that were supplemented with 2.5 µg and those supplemented with 5 µg 1α-OH-D3/kg feed for any of the parameters measured on D10 and D23, suggesting that there is no added benefit on Ca and P digestibility when increasing the supplementation of 1α-OH-D3 from 2.5 µg to 5 µg 1α-OH-D3/kg feed. Phytase improved AID Ca, AID P, dCa and dP in a stepwise fashion on both D10 and D23 when supplemented into the diet of birds at 500 or 1000 FTU phytase/kg. There was no interaction between 1α-OH-D3 and phytase for any of the parameters measured on D10 or D23. Animal and Wildlife Sciences MScAgric (Animal Science Animal Nutrition) Unrestricted 2023-07-13T14:13:11Z 2023-07-13T14:13:11Z 2023 2023 Thesis * S2023 http://hdl.handle.net/2263/91424 en © 2023 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 | Calcium Broilers Vitamin D Phytase 1α-Hydroxycholecalciferol Digestibility UCTD Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title | Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title_full | Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title_fullStr | Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title_full_unstemmed | Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title_short | Digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α-hydroxycholecalciferol in combination with phytase |
| title_sort | digestibility of dietary calcium and phosphorus in young and growing broilers supplemented with 1α hydroxycholecalciferol in combination with phytase |
| topic | Calcium Broilers Vitamin D Phytase 1α-Hydroxycholecalciferol Digestibility UCTD |
| url | http://hdl.handle.net/2263/91424 |