Effect of feeding system on FA in Astrualian beef

Title: Effect of feeding systems on omega-3 fatty acids, conjugated linoleic acid and trans fatty acids in Australian beef cuts: potential impact on human health
Author: Eric N Ponnampalam, Neil J Mann, Andrew J Sinclair
Date: 2006
Journal Source: RMIT University, Australia.
Link:http://www.seattlecentral.edu/faculty/jwhorley/FatsInBeef.pdf

Summary:
        In this research, Australian Scientist studied the Fatty Acids contents of Beef in three different feeding system through three different cuts. The three food system are: grass-fed, Short term grain-fed(STGF), and Long term grain-fed(LTFL); the three cuts are: rump cuts, strip loin cuts, and blade cuts.
        First, saturated fatty acid content is significantly higher in LTGF while it doesn't differ too much between grass-fed and STGF. Second, the 18:1-trans fat in grass-fed about half of STGF and a third of LTFL. In overall Omega-6 content, the Grass-fed has a lower amount. In overall Omega-3 content, the Grass-fed has higher amount though DHA does not have a major difference. The total long chain n-3 PUFA in grass-fed is similar to white fish. The grass-fed's Omega-3 to Omega-6 ratio is about 1:2, a very impressive amount. Also, in comparison, Rump cuts has the best Omega-3 contents followed by Blade cuts.