Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
High friction expansion of broiler feed prior to pelleting and its effect on broiler performance
Dissertation (MSc(Agric))--University of Pretoria, 2012.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2013
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613554869272576 |
|---|---|
| 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 | © 2012 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, 2012. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26194 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:59.731Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/26194 High friction expansion of broiler feed prior to pelleting and its effect on broiler performance Jansen van Rensburg, Christine Brandt, D. dieter.fleischmann@afgri.co.za Fleischmann, Dieter Cecil Broiler performance Broiler feed UCTD Dissertation (MSc(Agric))--University of Pretoria, 2012. High feed costs are part of any broiler rearing enterprise and continuous effort is required to help overcome this problem. The use of a feed expander may be beneficial in improving bird performance and thus increasing the profitability of broiler meat production. Four experiments were conducted to evaluate the performance of birds fed expanded feed in relation to the performance of birds fed non-expanded feed. The effect of feeding birds expanded feed was also tested under heat stress conditions. In this experiment, a significant improvement in cumulative feed conversion ratio (CFCR) was observed for birds fed expanded feed (Chapter 3). Pellet size influenced bird performance as birds fed a 3.2 mm non-expanded feed had a better cumulative FCR than the non-expanded 4.5 mm pellets, and this CFCR did not differ significantly from that in birds fed 3.2 mm expanded pellets (Chapter 4). There is, however, an improvement in the cumulative FCR to two weeks of age in birds fed expanded feed, over that in birds fed non-expanded feed, indicating that expanding of feed improves nutrient availability to the young broiler with a partially developed digestive tract. The effects of expanding feed on the body weight of birds were not consistent between experiments. This might be attributed to expanding temperature, as the feed in Chapters 3 and 4 was expanded at 90°C and not at higher temperatures as in the other chapters. Expanding feed at 90°C may not allow proper starch gelatinisation and alteration of nutrient availability. Expanded feed had better pellet durability than non-expanded feed and there were no significant negative effects on vitamin recovery, enzyme stability and nutrients when feed was expanded at temperatures between 95 and 1 05°C. Pellet quality increased with an increase in expanding temperature. Expanding of broiler feed led to a significant improvement in lipid digestibility (Chapter 6). Expanding of feed at 105°C is recommended as feed expanded at this temperatures tend to have significantly higher AMEn values for broilers than non-expanded feed. Animal and Wildlife Sciences unrestricted 2013-09-07T03:43:25Z 2013-07-12 2013-09-07T03:43:25Z 2013-04-10 2012 2013-07-10 Dissertation Fleischmann, DC 2012, High friction expansion of broiler feed prior to pelleting and its effect on broiler performance, MSc(Agric) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26194 > E13/4/533/gm http://hdl.handle.net/2263/26194 http://upetd.up.ac.za/thesis/available/etd-07102013-120747/ © 2012 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 | Broiler performance Broiler feed UCTD High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title | High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title_full | High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title_fullStr | High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title_full_unstemmed | High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title_short | High friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| title_sort | high friction expansion of broiler feed prior to pelleting and its effect on broiler performance |
| topic | Broiler performance Broiler feed UCTD |
| url | http://hdl.handle.net/2263/26194 http://upetd.up.ac.za/thesis/available/etd-07102013-120747/ |