Background ' Meat is a good source of beneficial long-chain omega-3 polyunsaturated fatty acids (LCn-3PUFA)that have several health benefits, including reducing the risk of cardiovascular disease, and mental health disorders.Concentrations of LCn-3PUFA are higher when animals are fed forages compared to grain. Little research hasexamined the effects of producing silage from forage on the amount of omega-3 available for meat production.Objective ' To examine changes in omega-3 levels in forages following ensiling under Australian conditions and toidentify silage production methods that maximise the conservation of omega-3 ('-linolenic acid), to potentiallyincrease the quality and health benefits of meat consumed from animals fed this silage.Design ' Silage will be produced from different forage types. Fatty acids will be measured in different lipidfractions prior to and following ensiling. An estimation of rumen biohydrogenation of omega-3 and omega-6 fattyacids will assess the amount of fatty acid available for incorporation into meat.Outcomes ' Silages have been produced from triticale and lucerne. Techniques are being established to extractindividual lipid fractions from forage and to quantitatively determine fatty acid concentrations. Typically, cerealforage pre-ensiling contains around 2.25% fat (ether extract) and approximately 40-50% of total fatty acids as '-linolenic acid. Studies are continuing to examine concentrations in forage and potential breakdown(biohydrogenation) in the rumen in vitro.Conclusions ' If '-linolenic acid is released as free fatty acid during the ensiling process, less will be available formetabolism to LCn-3PUFA and subsequent incorporation into meat. Initial results will form the basis of a project toexamine the effects of different methods of silage production on LCn-3PUFA concentrations in meat.
|Title of host publication||Proceedings of the Nutrition Society of Australia|
|Place of Publication||Melbourne|
|Publication status||Published - 2008|
|Event||Asia Pacific Journal of Clinical Nutrition - Glenelg, Australia|
Duration: 30 Nov 2008 → 03 Dec 2008
|Conference||Asia Pacific Journal of Clinical Nutrition|
|Period||30/11/08 → 03/12/08|
Clayton, E., Piltz, J., Zhao, J., & Wynn, P. (2008). Maximising omega-3 available for meat through production of high quality silage. In M. Wahlqvist (Ed.), Proceedings of the Nutrition Society of Australia (Vol. 17, pp. S116 (P12)). HEC Press.