Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement
Dissertation (MSc Agric (Animal Nutrition)--University of Pretoria, 2022.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2023
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613567040094208 |
|---|---|
| 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 Nutrition)--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/89420 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:11.690Z |
| 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:2263/89420 Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement Jansen van Rensburg, Christine celestevandeventer121@gmail.com Taljaard, Celesté UCTD Guanidinoacetic acid CreAMINO supplementation Lohmann Brown layer Production performance Feed supplement Dissertation (MSc Agric (Animal Nutrition)--University of Pretoria, 2022. This study was conducted to investigate the impact of guanidinoacetic acid (GAA) on layer hen performance, egg quality and hen health and whether GAA may contribute towards energy available to the hen. Six hundred Lohmann Brown layer hens were placed in individual cages and used for experimental purposes from point-of-lay at 18 weeks-of-age until termination of study at 34 weeks-of-age. The 600 pullets were divided into six dietary treatments with 10 replicates per treatment. The six dietary treatments consisted of two main effects, i.e., diet energy concentration and the inclusion of a GAA containing product, CreAMINO. Each of two energy concentrations (standard or reduced) were combined with one of three levels of CreAMINO (0, 0.08% or 0.12%). The effect of CreAMINO supplementation was combined with a reduced dietary energy level to test for a possible energy-sparing effect in layer hens. If an increase in GAA in the diet can lead to an increase in creatine and ATP, a subsequent increase in available energy is possible. Therefore, less energy will be needed via the feed. A lower energy dense diet supplemented with GAA, may have the same effect as a standard or high energy diet without containing GAA. Over a period of 18 weeks, bodyweight, feed intake, egg production, egg quality and liver and gut health were measured. The feed efficiency and energy efficiency were also calculated at the end of the trial. Feed conversion ratio (FCR) was calculated as gram of feed per gram of egg produced. Feed consumed per dozen of eggs produced, was also recorded. Energy efficiency was determined by dividing the calculated energy intake with the weight of eggs produced. The overall results showed that hens did compensate for a reduced energy diet by increasing feed intake, whether supplemented with CreAMINO or not. CreAMINO treatment had no significant effect on any of the parameters. There were, however, some negative effects of CreAMINO on liver health, although none of it detrimental. Due to the higher feed intake of the hens from the reduced energy group, compared to the hens receiving the standard diet, no energy-sparing effect was observed in the hens. In the case where an energy-sparing effect was present due to CreAMINO, all hens across different treatment groups would have had the same feed intakes. The results showed that no positive effects could be seen on hen performance, hen health, or egg quality by supplementing CreAMINO to the diets of early to peak layer hens. Alzchem, Trostberg, Germany Animal and Wildlife Sciences MSc Agric (Animal Nutrition) Unrestricted 2023-02-10T13:41:43Z 2023-02-10T13:41:43Z 2023 2022 Dissertation * A2023 https://repository.up.ac.za/handle/2263/89420 10.25403/UPresearchdata.22060697 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 | UCTD Guanidinoacetic acid CreAMINO supplementation Lohmann Brown layer Production performance Feed supplement Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title | Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title_full | Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title_fullStr | Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title_full_unstemmed | Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title_short | Production performance & health of Lohmann Brown layer hens that received guanidinoacetic acid as a feed supplement |
| title_sort | production performance health of lohmann brown layer hens that received guanidinoacetic acid as a feed supplement |
| topic | UCTD Guanidinoacetic acid CreAMINO supplementation Lohmann Brown layer Production performance Feed supplement |
| url | https://repository.up.ac.za/handle/2263/89420 |