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An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters
Thesis (MScAgric)--Stellenbosch University, 2022.
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Stellenbosch : Stellenbosch University
2022
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| _version_ | 1867614025650536448 |
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| access_status_str | Open Access |
| author | Van Niekerk, Marguerite |
| author2 | Van Zyl, Johan Hendrik Combrink
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| author_browse | Van Niekerk, Marguerite Van Zyl, Johan Hendrik Combrink |
| author_facet | Van Zyl, Johan Hendrik Combrink
Van Niekerk, Marguerite |
| author_sort | Van Niekerk, Marguerite |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScAgric)--Stellenbosch University, 2022. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/126082 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:45:28.762Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/126082 An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters Van Niekerk, Marguerite Van Zyl, Johan Hendrik Combrink Cruywagen, C. W. Van Wyngaard, J. D. V. Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences. In vitro Protein Distiller’s dried grains with solubles (DDGS) Lamb -- Feeding and feeds Feedlots Proteins in animal nutrition Soybean meal as feed -- Nutritional aspects UCTD Thesis (MScAgric)--Stellenbosch University, 2022. ENGLISH ABSTRACT: Protein supplements are a very costly component of animal feed and the importance of allocating high-quality protein sources that is economically viable, consistent, and sustainable is important. By feeding human-inedible feed to ruminant animals to produce human-edible animal proteins will advance sustainability. An example of such an alternative high in protein feed source, is distiller’s dried grains with solubles (DDGS). It is also a potentially low-cost protein source compared to oil seed meals. This study investigated the nutritional potential of DDGS to replace soybean meal in comparison with other protein raw materials, dried brewer grains (DBG), cottonseed meal (CSM), and the effect of the least cost optimal formulated diet with these protein sources in growing lamb diets. In the first study (Chapter 3) the extent and rate of ruminal protein degradation of the different protein sources was determined against dried DDGS for ruminants. Five different protein samples, soybean meal, cottonseed meal, dried brewers grain, canola meal and DDGS were incubated for 0, 2, 4, 8, 16, 24, and 48 h. The effective degradability was calculated with an hourly disappearance rate of 5% and 8% per hour. The observed rumen undegradable protein content (kp = 0.08/h) was the lowest for soybean meal (47%) followed by canola meal (49%), distillers’ grains and solubles (50%), cottonseed meal (64%) and then dried brewers grain (68%). Non-significant differences were observed in the ruminal degradation rates between soybean meal and DDGS. The second study (Chapter 4) investigated how the different protein treatment diets affected growth parameters, carcass characteristics and profitability of feedlot lambs. The treatment diets were formulated to be iso-nitrogenous, iso-energetic and contained one of five different protein sources, soybean meal, DDGS, cottonseed meal, dried brewers grain, and the least cost optimal formulation. Thirty-five Dohne Merino wethers were allocated to treatments in a completely randomized design, with five treatments and seven replicates. No differences were observed in final body weight and feed efficiency as a result of the dietary treatment. Carcass weights also did not differ (P > 0.05). In conclusion, this trial determined that DDGS could economically replace soybean meal as a feed source to use in feedlot diets, and could be a valuable cost effective feed source to farmers and feed manufacturers. AFRIKAANSE OPSOMMING: Proteïenaanvulling is 'n baie duur komponent van veerantsoene en die belangrikheid daarvan om hoë gehalte proteïenbronne te vind wat ekonomies, konsekwent en volhoubaar is, is van belang. Deur voerbronne wat nie deur mense benut kan word nie aan herkouerdiere te verskaf en in menslik benutbare diereproteïen om te skakel, sal volhoubaarheid bevorder. 'n Voorbeeld van so 'n alternatiewe voerbron, wat hoog is in proteïen, is gedistilleerde gedroogde grane met oplosbare stowwe (DDGS). Dit is ook 'n potensieel laekoste-proteïenbron in vergelyking met oliekoekproteïenbronne. Hierdie studie het die voedingspotensiaal van DDGS om sojaboonoliekoekmeel te vervang ondersoek in vergelyking met ander proteïenbevattende grondstowwe, gedroogde brouersgraan, katoensaadoliekoekmeel, en die goedkoopste optimale geformuleerde dieet (mengsel van genoemde proteïenbronne) in lamafrondrantsoene. In die eerste studie (Hoofstuk 3) is die mate en tempo van ruminale proteïenafbraak van die verskillende proteïenbronne teen DDGS vir herkouers bepaal. Vyf verskillende proteïengrondstowwe insluitend sojaboonoliekoekmeel, katoensaadoliekoekmeel, gedroogde brouersgraan, kanolaoliekoekmeel en DDGS is vir 0, 2, 4, 8, 16, 24 en 48 h in vitro geïnkubeer. Die effektiewe afbreekbaarheid is bereken met 'n uurlikse verdwyntempo van 5% en 8% per uur. Die waargenome rumen-onafbreekbare proteïeninhoud (kp = 0.08/h) was die laagste vir sojaoliekoekmeel (47%), gevolg deur kanolaoliekoekmeel (49%), DDGS (50%), katoensaadoliekoekmeel (64%) en dan gedroogde brouersgraan (68%). Geen betekenisvolle verskille is waargeneem in die rumen afbreekbare tempo tussen sojaboonoliekoekmeel en DDGS nie. In die tweede studie (Hoofstuk 4) was daar ondersoek ingestel hoe die verskillende proteïenbehandelingsdiëte groei- slag en winsgewendheidsparameters van voerkraallammers beïnvloed. Die behandelingsdiëte is geformuleer om iso-stikstof, iso-energie te wees en het een van vyf verskillende proteïenbronne bevat, sojaboonoliekoekmeel, DDGS, katoensaadoliekoekmeel, gedroogde brouersgraan en die laagste koste optimale formulering. Vyf-en-dertig Dohne Merino hammels was in ‘n heeltemal ewekansige ontwerp ingedeel met vyf behandelings en sewe herhalings. Geen betekenisvolle verskille is waargeneem in finale liggaamsmassa en voerdoeltreffendheid as gevolg van die dieetbehandeling nie. Karkas massas het ook nie verskil nie (P > 0.05). Ten slotte het hierdie navorsing bepaal dat DDGS inderdaad sojaboonoliekoekmeel ekonomies kan vervang as 'n proteïenbron om in voerkraalrantsoene te gebruik, en 'n waardevolle voerbron vir boere en voervervaardigers kan wees. Masters 2022-11-18T08:16:31Z 2023-01-16T12:49:11Z 2022-11-18T08:16:31Z 2023-01-16T12:49:11Z 2022-12 Thesis http://hdl.handle.net/10019.1/126082 en_ZA Stellenbosch University xiii, 93 pages : illustrations (some color) application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | In vitro Protein Distiller’s dried grains with solubles (DDGS) Lamb -- Feeding and feeds Feedlots Proteins in animal nutrition Soybean meal as feed -- Nutritional aspects UCTD Van Niekerk, Marguerite An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title | An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title_full | An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title_fullStr | An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title_full_unstemmed | An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title_short | An in vitro comparison of plant‐based protein sources and their effects on feedlot lamb growth parameters |
| title_sort | in vitro comparison of plant based protein sources and their effects on feedlot lamb growth parameters |
| topic | In vitro Protein Distiller’s dried grains with solubles (DDGS) Lamb -- Feeding and feeds Feedlots Proteins in animal nutrition Soybean meal as feed -- Nutritional aspects UCTD |
| url | http://hdl.handle.net/10019.1/126082 |
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