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https://hdl.handle.net/2440/22444
Type: | Thesis |
Title: | Genetic variation in fatty acid composition of cattle / by Enoch Othniel Malau Aduli. |
Author: | Malau-Aduli, Enoch Othniel |
Issue Date: | 1998 |
School/Discipline: | Dept. of Animal Sciences |
Abstract: | Examines 3 hypotheses: that the lipid levels and fatty acid composition of meat produced in Australia may vary between cattle genotypes, ages, sexes, seasons, and anatomical sites of sampling; that genetic variation may be sufficiently large to warrant selective crossbreeding of dams to different sire genotypes as an improvement strategy in the proportion of monounsaturated fatty acids in beef; and, that genotype differences in bovine tissue may exist when phospholipid and triacylglycerol fractions of total lipids are analysed separately, regardless of fatness of the cattle. Genetic variation in fatty acid composition of 7 different cattle breads were examined in experiments using non-lactating cows, yearling steers, yearling heifers and weaner calves. Breed differences were found in the muscle and adipose tissues when phospholipid and triacylglycerol fractions were analysed separately regardless of the fatness of the cattle. Differences in age, sex, season and anatomical site were also significant. The study concludes that breed differences in fatty acid composition are related to fatness and stage of maturity such that early-maturing cattle are fatter, contain higher proportions of unsaturates, and have softer fats with low melting points than lean, late-maturing cattle. It is recommended that total lipids be separated into triacylglycerol and phospholipid fractions and analysed separately. Desturation indexes could be used as a biochemical marker for beef breeding decisions, and genetic parameters presented used for future selection indices for fatty acids in carcass quality assessment. |
Dissertation Note: | Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Science, 1999 |
Subject: | Cattle Genetics. Cattle Breeding Australia Fatty Acids Metabolism. Agricultural chemistry |
Description: | Copies of 16 publications from the thesis, authored and co-authored by the author, included as appendix. Includes bibliographical references (leaves 195-220). 1 v. (various pagings) : ill. ; 30 cm. |
Provenance: | Copyright material removed from digital thesis. See print copy in University of Adelaide Library for full text. This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exception. If you are the author of this thesis and do not wish it to be made publicly available or If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals |
Appears in Collections: | Research Theses |
Files in This Item:
File | Description | Size | Format | |
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01front.pdf | 64.64 kB | Adobe PDF | View/Open | |
02whole.pdf | 11.79 MB | Adobe PDF | View/Open | |
Permissions Restricted Access | Library staff access only | 1.24 MB | Adobe PDF | View/Open |
Restricted Restricted Access | Library staff access only | 16.46 MB | Adobe PDF | View/Open |
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