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Evaluation of commercial feedgrade oils for use in broiler nutrition
Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613919858655232 |
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| access_status_str | Open Access |
| author | De Wet, Lourens Francois |
| author2 | Hayes, J. P. |
| author_browse | De Wet, Lourens Francois Hayes, J. P. |
| author_facet | Hayes, J. P. De Wet, Lourens Francois |
| author_sort | De Wet, Lourens Francois |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55880 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:43:48.089Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/55880 Evaluation of commercial feedgrade oils for use in broiler nutrition De Wet, Lourens Francois Hayes, J. P. Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Science. Broilers (Poultry) -- Feeding and feeds Broilers (Poultry) -- Nutrition Poultry -- Nutrition Oils and fats, Edible -- Evaluation Oils and fats in animal nutrition Dissertations -- Agriculture Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1998. Intensively reared broilers are fed on diets of high nutrient and energy concentration, where nutrient requirements are met with high-quality raw materials. Although pure oils, such as sunflower oil and marine oil, have been the traditional energy sources used in broiler diets, attractive costs have alternatively increased interest in the utilization of by-product or feed-grade oils. Many of these by-product oils have nutrient characteristics that make them suitable additions to broiler diets. The energy values of conventional pure oils used for broiler feed are fairly well-established. When by-product oils are used, however, diet formulation becomes more difficult, in particular regarding the utilization of these components. These by-product oils are diverse entities and highly variable commodities in their dietary energy-yielding values. Many complicated and interacting factors must be considered when endeavouring to explain the effects of specific chemical and physical characteristics of particular fatty acids on energetic efficiency. In this dissertation, the effects of specific chemical characteristics of oils on their utilization are reviewed. Bearing in mind the problems associated with the evaluation of the energetic value of feed lipids, an experiment was conducted at the Marienchildt Poultry Research Farm, Stellenbosch, to determine the energetic efficiency of four commercial feedgrade oils for use in broiler nutrition. Additionally, purified sunflower oil was selected to serve as control in order to keep the levels of non-nutritive factors present in lipids to a minimum. Requirements for maintenance and the utilization of nitrogen-corrected true metabolizable energy (TMEn) were assessed by means of comparative slaughter technique and balance method. The TMEn values of the feedgrade oils varied between 29.220 ±0.5548 and 33.934 ±1.1052 MJ/kg, compared to 35.890 ±0.8775 MJ/kg for sunflower oil. Average metabolizable energy (TMEn) required for maintenance, were 0.419 ±0.0385 MJ/W₀·⁷⁵. Estimated TMEn utilization efficiencies for the test diets averaged at 0.692 ±0.042, 0.582 ±0.694 and 0.811 ±0.790 for growth (k₉), protein energy retention (kₚ), and lipid energy retention (kₗ) respectively. The only trends observed were the increasing energetic efficiencies of the oils with a decrease in the degree of saturation and decrease in the free fatty acid content (FFA). Sunflower oil showed superior utilization in all instances. The research results reported in this dissertation correspond well with previously published and unpublished results, and indicate that the five oils are acceptable as good sources of energy for use in broiler diets. Masters 2012-08-27T11:37:16Z 2012-08-27T11:37:16Z 1998 Thesis http://hdl.handle.net/10019.1/55880 en Stellenbosch University 153 pages application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Broilers (Poultry) -- Feeding and feeds Broilers (Poultry) -- Nutrition Poultry -- Nutrition Oils and fats, Edible -- Evaluation Oils and fats in animal nutrition Dissertations -- Agriculture De Wet, Lourens Francois Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title | Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title_full | Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title_fullStr | Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title_full_unstemmed | Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title_short | Evaluation of commercial feedgrade oils for use in broiler nutrition |
| title_sort | evaluation of commercial feedgrade oils for use in broiler nutrition |
| topic | Broilers (Poultry) -- Feeding and feeds Broilers (Poultry) -- Nutrition Poultry -- Nutrition Oils and fats, Edible -- Evaluation Oils and fats in animal nutrition Dissertations -- Agriculture |
| url | http://hdl.handle.net/10019.1/55880 |
| work_keys_str_mv | AT dewetlourensfrancois evaluationofcommercialfeedgradeoilsforuseinbroilernutrition |