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Table 2 Comparison of mean polyunsatured fatty acid composition (expressed as mg/g of fatty acid or as a % of total lipid) between grass-fed and grain-fed cattle.

From: A review of fatty acid profiles and antioxidant content in grass-fed and grain-fed beef

  Fatty Acid
Author, publication year, breed, treatment C18:1 t11 Vaccenic Acid C18:2 n-6 Linoleic Total CLA C18:3 n-3 Linolenic C20:5n-3 EPA C22:5n-3 DPA C22:6n-3 DHA Total PUFA Total MUFA Total n-6 Total n-3 n-6/n-3 ratio
Alfaia, et al., 2009, Crossbred steers g/100 g lipid
   Grass 1.35 12.55 5.14* 5.53* 2.13* 2.56* 0.20* 28.99* 24.69* 17.97* 10.41* 1.77*
   Grain 0.92 11.95 2.65* 0.48* 0.47* 0.91* 0.11* 19.06* 34.99* 17.08 1.97* 8.99*
Leheska, et al., 2008, Mixed cattle g/100 g lipid
   Grass 2.95* 2.01 0.85* 0.71* 0.31 0.24* na 3.41 42.5* 2.30 1.07* 2.78*
   Grain 0.51* 2.38 0.48* 0.13* 0.19 0.06* na 2.77 46.2* 2.58 0.19* 13.6*
Garcia, et al., 2008, Angus steers % of total FAs
   Grass 3.22* 3.41 0.72* 1.30* 0.52* 0.70* 0.43* 7.95 37.7* 5.00* 2.95* 1.72*
   Grain 2.25* 3.93 0.58* 0.74* 0.12* 0.30* 0.14* 9.31 40.8* 8.05* 0.86* 10.38*
Ponnampalam, et al., 2006, Angus steers mg/100 g muscle tissue
   Grass na 108.8* 14.3 32.4* 24.5* 36.5* 4.2 na 930* 191.6 97.6* 1.96*
   Grain na 167.4* 16.1 14.9* 13.1* 31.6* 3.7 na 1729* 253.8 63.3* 3.57*
Nuernberg, et al., 2005, Simmental bulls % of total fatty acids
   Grass na 6.56 0.87* 2.22* 0.94* 1.32* 0.17* 14.29* 56.09 9.80 4.70* 2.04*
   Grain na 5.22 0.72* 0.46* 0.08* 0.29* 0.05* 9.07* 55.51 7.73 0.90* 8.34*
Descalzo, et al., 2005, Crossbred steers % of total FAs
   Grass 4.2* 5.4 na 1.4* tr 0.6 tr 10.31* 34.17* 7.4 2.0 3.72*
   Grain 2.8* 4.7 na 0.7* tr 0.4 tr 7.29* 37.83* 6.3 1.1 5.73*
Realini, et al., 2004, Hereford steers % fatty acid within intramuscular fat
   Grass na 3.29* 0.53* 1.34* 0.69* 1.04* 0.09 9.96* 40.96* na na 1.44*
   Grain na 2.84* 0.25* 0.35* 0.30* 0.56* 0.09 6.02* 46.36* na na 3.00*
  1. * Indicates a significant difference (at least P < 0.05) between feeding regimens within each respective study reported. "na" indicates that the value was not reported in the original study. "tr" indicates trace amounts detected.