Skip to main content

Advertisement

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.