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Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle.
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_ | 1867613629209116672 |
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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 | © 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:2263/86054 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:11.002Z |
| 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:2263/86054 Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. Erasmus, L.J. (Lourens Jacobus) marnuslieb@gmail.com Du Toit, C.J.L. Webb, E.C. (Edward Cottington) Liebenberg, Marnus Urea Amino Acids Feedlot Protein Quality Performance UCTD 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, 2022. The objective of this study was to evaluate the effect of rumen undegradable protein (RUP) and rumen protected lysine (RPLys) and methionine (RPMet) supplementation on growth performance, blood parameters and carcass characteristics of feedlot cattle over a 135-day feeding period. One hundred and twenty Bonsmara type steers were blocked by body weight and randomly allocated to one of four treatment diets in a complete randomised block design. Each treatment consisted of 5 pens with 6 animals per pen. The treatments were 1) Basal diet supplemented with urea (CON), 2) Basal diet supplemented with RUP (RUP), 3) Basal diet supplemented with RUP and RPLys (RUP+L) and 4) Basal diet supplemented with RUP and RPLys and RPMet (RUP+L+M). Data was statistically analysed using the PROC MIXED model (SAS, 2021). The average daily gain (ADG) and feed conversion ratio (FCR) did not differ between treatments and ranged from 1.84 to 1.90 kg/d and 4.84 to 5.04 kg feed / kg gain respectively (P>0.05). Treatments RUP+L and RUP+L+M resulted in lower serum blood urea nitrogen (BUN) concentrations on three sampling days when compared to the CON treatment which is indicative of better N utilisation (P<0.05).Serum blood AA were reduced for Ala, Glu, Pro and Tyr on sampling day 99 and reduced for Ileu, Lys, Leu, Val , Pro and Tyr when treatment RUP+L+M is compared to CON suggesting an increased uptake and utilisation of these AA for protein and muscle deposition (P<0.05). The 13th rib subcutaneous fatness was lower for treatment RUP+L+M compared to the other treatments (P < 0.05) and accordingly the channel fat mass of carcasses from animals supplemented with both RPLys and RPMet was lower than the CON group (P<0.05). This suggest that Lys and Met supplementation as well as the ratio of Lys to Met may be important factors to consider if the consumer demands leaner carcasses. In conclusion, a diet formulated according to NRC standards with sufficient RDP, energy and effective NDF that promotes optimal rumen fermentation can achieve above average growth performance and do not need to be supplemented with additional RUP or RPAA to meet MP requirements. Supplementation of RPLys and Met has shown potential for production of leaner carcasses. Red meat research and development south africa Protein research foundation 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 2022-07-06T11:21:49Z 2022-07-06T11:21:49Z 2022-09 2022-07 Thesis * S2022 https://repository.up.ac.za/handle/2263/86054 10.25403/UPresearchdata.20227740.v1 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 | Urea Amino Acids Feedlot Protein Quality Performance UCTD Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title | Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title_full | Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title_fullStr | Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title_full_unstemmed | Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title_short | Effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle. |
| title_sort | effect of dietary protein quality and rumen protected amino acid supplementation on performance and carcass characteristics of feedlot cattle |
| topic | Urea Amino Acids Feedlot Protein Quality Performance UCTD Natural and agricultural sciences theses SDG-02 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 |
| url | https://repository.up.ac.za/handle/2263/86054 |