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.

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*


* 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.

Daley et al. Nutrition Journal 2010 9:10   doi:10.1186/1475-2891-9-10

Open Data