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Table 2 Effect of production system and growth implant strategy on fatty acid composition (% of total fatty acids) from subcutaneous fat of feedlot steers

From: Subcutaneous fatty acid composition of steers finished as weanlings or yearlings with and without growth promotants

 

Production system

Implant strategy

 

P-value

Variable

Calf-finished

Yearling-finished

No

Yes

s.e.m

PS

IS

 Total fatty acids (g/g of tissue)

0.90b

0.93a

0.92

0.90

0.01

0.01

0.91

∑ PUFA

1.62

1.69

1.55b

1.77a

0.07

0.54

0.01

 ∑ n-6

1.39

1.42

1.30b

1.51a

0.06

0.74

<0.001

 C18:2n-6

1.32

1.36

1.24b

1.45a

0.06

0.67

<0.001

 C20:2n-6

0.02

0.02

0.02

0.02

0.002

0.71

0.49

 C20:3n-6

0.05a

0.04b

0.05

0.04

0.004

0.05

0.89

n-3

       

 C18:3n-3

0.23

0.27

0.25

0.26

0.01

0.09

0.26

∑ AD

0.61

0.64

0.62

0.63

0.02

0.35

0.71

c 9,t 13-/t 8,c 13-18:2

0.20

0.22

0.21

0.20

0.01

0.28

0.31

t 8,c 12-/c 9,t 12-18:2

0.11

0.12

0.11

0.12

0.01

0.37

0.11

t 9,c 12-18:2

0.07a

0.02b

0.05

0.05

0.01

<0.001

0.95

t 11,c 15-18:2

0.04b

0.12a

0.07

0.09

0.01

<0.001

0.09

c 9,c 15-18:2

0.19

0.18

0.19

0.18

0.01

0.56

0.35

∑ CLA

0.54

0.49

0.51

0.52

0.02

0.14

0.63

t 7,c 9-/c 9,t 11-18:2

0.48

0.41

0.44

0.45

0.02

0.12

0.76

c 10,t 12-18:2

0.02

0.02

0.02

0.02

0.01

0.11

0.73

t 9,t 11-18:2

0.04

0.05

0.04

0.05

0.01

0.21

0.35

t 18:1

3.29

3.19

3.00

3.46

0.36

0.49

0.61

t 6/t 7/t 8-18:1

0.25

0.25

0.23b

0.28a

0.01

0.98

<0.001

t 9-18:1

0.27

0.27

0.26b

0.28a

0.01

0.72

0.01

t 10-18:1

1.57

1.65

1.43b

1.79a

0.12

0.67

0.01

t 11-18:1

0.67

0.54

0.60

0.61

0.06

0.23

0.92

t 12-18:1

0.14a

0.10b

0.12

0.12

0.01

0.01

0.46

t 13/t 14-18:1

0.27

0.27

0.26

0.27

0.01

0.70

0.29

t 16/c 14-18:1

0.12

0.10

0.11

0.11

0.01

0.31

0.93

∑ MUFA

51.4

51.9

52.1

51.2

0.52

0.63

0.14

 ∑ c-MUFA

50.0

50.0

11.2

10.4

0.05

0.50

0.85

c 9-14:1

1.70a

1.32b

1.59a

1.43b

0.06

<0.001

0.05

c 7-16:1

0.15

0.15

0.15

0.15

0.01

0.54

0.45

c 9-16:1

5.24

4.71

5.16

4.80

0.17

0.09

0.15

c 11-16:1

0.37a

0.29b

0.35

0.32

0.02

<0.001

0.07

c 9-17:1

0.51b

1.31a

0.91

0.910

0.13

0.02

0.99

c 9-18:1

39.0

39.5

39.6

38.9

0.39

0.43

0.16

c 11-18:1

1.79

1.76

1.84

1.71

0.06

0.79

0.13

c 12-18:1

0.10a

0.08b

0.09

0.09

0.01

0.03

0.34

c 13-18:1

0.68a

0.58b

0.66

0.60

0.03

0.04

0.15

c 16-18:1

0.06

0.05

0.05

0.05

0.01

0.26

0.68

c 9-20:1

0.09a

0.02b

0.06

0.05

0.01

0.01

0.18

c 11-20:1

0.32a

0.26b

0.31a

0.27b

0.01

0.02

0.01

∑ BCFA

1.14b

1.45a

1.28

1.32

0.01

0.05

0.96

iso- 15:0

0.11b

0.16a

0.13

0.13

0.01

0.01

0.84

anteiso-15:0

0.15b

0.19a

0.17

0.18

0.01

<0.001

0.19

iso- 16:0

0.14b

0.22a

0.18

0.18

0.01

<0.001

0.83

iso- 17:0

0.32b

0.35a

0.33

0.34

0.01

0.05

0.27

 anteiso-17:0

0.56b

0.66a

0.59b

0.63a

0.01

<0.001

0.01

iso- 18:0

0.12b

0.17a

0.15

0.14

0.01

<0.001

0.46

∑ SFA

42.2

41.9

41.7

42.4

0.52

0.75

0.23

 C14:0

3.85a

3.39b

3.65

3.57

0.08

0.01

0.43

 C15:0

0.47b

0.65a

0.56

0.56

0.01

<0.001

0.94

 C16:0

27.5

26.7

27.2

26.9

0.31

0.13

0.54

 C17:0

1.02

1.09

0.99

1.12

0.14

0.81

0.11

 C18:0

9.34

10.1

9.23

10.2

0.35

0.20

0.09

 C19:0

0.25

0.24

0.24

0.25

0.01

0.65

0.38

 C20:0

0.04

0.04

0.04

0.05

0.01

0.84

0.73

  1. a,b,cMeans with different superscripts for a particular FA profile are significantly different (P < 0.05); s.e.m, standard error of mean; PS, production system effect; IS, Implant strategy effect; c, cis; t, trans; ∑ PUFA, sum of polyunsaturated FA = C18:3n- 3 + C18:2n- 6 + C20:2n- 6 + C20:3n-6; ∑ n-6, sum of omega-6 FA = C18:2n- 6 + C20:2n- 6 + 20:3n- 6; ∑ AD, total atypical dienes = c 9,t 13-/t 8,c 13 + t 8,c 12-/c 9,t 12 + t 9,c 12 + t 11,c 15 + c 9,c 15; ∑ CLA, conjugated linoleic acid = c 7,t 9-/c 9,t 11- + c 10,t 12-18:2 + t 9,t 11-18:2; ∑ t-18:1, sum of trans-18 :1 isomers = t 6-t 8-18:1 + t 9-18:1 + t 10-18:1 + t 11-18:1 + t 12-18:1 + t 13/t 14-18:1 + t 16-/c 14-18:1; ∑ MUFA, sum of monounsaturated FA = ∑ t-18:1 + ∑ t-MUFA; ∑ c-MUFA, sum of cis- monounsaturated FA = c 9-14:1 + c 7-16:1 + c 9-16:1 + c 11-16:1 + c 9-17:1 + c 11-18:1 + c 12-18:1 + c 13-18:1 + c 16-18:1 + c 9-20:1 + c 11-20:1; ∑ BCFA, sum of branched chain FA = iso- 15:0 + anteiso-15:0 + iso-16:0 + anteiso-17:0 + iso-18:0; ∑ SFA, sum of saturated FA = C14:0 + C15:0 + C16:0 + C17:0 + C18:0 + C19:0 + 20:0.