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Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs
Dissertation (MSc Agric (Animal Science: Animal Nutrition))--University of Pretoria, 2021.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613535745343488 |
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| access_status_str | Open Access |
| author2 | Erasmus, L.J. (Lourens Jacobus) |
| author_browse | Erasmus, L.J. (Lourens Jacobus) |
| author_facet | Erasmus, L.J. (Lourens Jacobus) |
| 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, 2021. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/80175 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:41.969Z |
| 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:2263/80175 Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs Erasmus, L.J. (Lourens Jacobus) ivan.h.greeff@gmail.com Du Toit, C.J.L. Greeff, Ivan UCTD Lamb feedlot performance average daily gain digestibility coefficients dry matter intake rumen ammonia nitrogen rumen pH feed conversion Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 Dissertation (MSc Agric (Animal Science: Animal Nutrition))--University of Pretoria, 2021. determine to what extent it can replace a natural protein source without negatively affecting feedlot performance and rumen fermentation dynamics of lambs. The treatments were 0% urea (control), 0.42% urea, 0.83% urea, 1.25% urea and 1.66% urea. Experiment one was a feedlot study and experiment two a rumen fermentation and digestibility study. Results from experiment one showed that there was a linear decrease in dry matter intake as the levels of urea increased. The 0% urea treatment had the highest average daily gain (0.309kg/lamb/day) and the 1.66% treatment had the best feed conversion ratio of 5.63. The higher inclusion of natural protein in the 0% and 0.42% urea treatments resulted in higher cold carcass weight. In experiment two the dry matter, organic matter, crude protein and energy apparent digestibility coefficients were lower for the 0% urea compared to the 1.66% urea. The 1.25% urea treatment had the lowest average rumen pH of 5.35, and the 0% urea had the lowest average rumen ammonia nitrogen concentration of 13.09. The results suggest that urea can be included up to 1.66% of total diet dry matter in finishing lamb diets without having a depressed dry matter intake, growth performance, digestibility and fermentation of certain rumen parameters of sheep. Voermol Feeds bs2026 Animal and Wildlife Sciences MSc Agric (Animal Science: Animal Nutrition) Unrestricted SDG-02: Zero hunger SDG-12: Responsible consumption and production SDG-13: Climate action 2021-05-31T14:18:20Z 2021-05-31T14:18:20Z 2021 2021 Dissertation * S2021 http://hdl.handle.net/2263/80175 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 Lamb feedlot performance average daily gain digestibility coefficients dry matter intake rumen ammonia nitrogen rumen pH feed conversion Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title | Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title_full | Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title_fullStr | Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title_full_unstemmed | Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title_short | Effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| title_sort | effect of protein source and level of urea supplementation on performance and rumen fermentation dynamics in feedlot lambs |
| topic | UCTD Lamb feedlot performance average daily gain digestibility coefficients dry matter intake rumen ammonia nitrogen rumen pH feed conversion Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 |
| url | http://hdl.handle.net/2263/80175 |