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Table 2 Selected milk lipid fatty acids during period 2 (>42 until 105 DIM)

From: A commonly used rumen-protected conjugated linoleic acid supplement marginally affects fatty acid distribution of body tissues and gene expression of mammary gland in heifers during early lactation

Fatty acid [g/day] Treatment1 SEM P-value
  CON CLA   Trt Trt x WL2
4:0 37.3 33.5 1.9 0.186 0.470
6:0 29.8 23.3* 1.6 0.016 0.767
8:0 16.6 11.8* 1.2 0.011 0.824
10:0 41.1 27.5* 3.2 0.015 0.888
12:0 47.1 30.4* 3.8 0.013 0.931
14:0 129 104 8.1 0.059 0.858
c 9-14:1 11.0 6x.9 1.3 0.052 0.977
15:0 14.8 10.2 1.5 0.055 0.430
16:0 364 267* 19.7 0.009 0.346
c 9-16:1 15.2 12.8 1.3 0.240 0.800
17:0 5.8 5.0 0.4 0.182 0.410
18:0 72.3 72.9 4.5 0.927 0.261
t 6/t 7/t 8-18:1 1.2 1.6 0.15 0.075 0.250
t 9-18:1 1.7 2.1 0.14 0.078 0.484
t 10-18:1 2.6 4.3 0.62 0.080 0.708
t 11-18:1 5.0 6.1 0.38 0.073 0.364
t 12-18:1 2.1 2.6 0.20 0.121 0.220
t 13/t 14-18:1 2.5 2.7 0.21 0.590 0.033
c 9-18:1 139 150 8.5 0.375 0.388
c 11-18:1 6.0 6.4 0.67 0.671 0.624
c 12-18:1 1.9 2.4 0.19 0.075 0.253
c 13-18:1 0.7 0.8 0.06 0.664 0.911
18:2 n-6 13.3 14.5 0.97 0.384 0.924
18:3 n-3 0.31 0.24 0.02 0.069 0.253
CLA
 c 9,t 11-CLA 3.4 4.3 0.34 0.093 0.767
 t 10,c 12-CLA 0.00 0.37* 0.04 0.000 0.030
 Other CLA 0.73 0.91 0.07 0.078 0.211
Summations
  ∑ SFA 781 608* 39.9 0.014 0.582
  ∑ MUFA 199 208 11.5 0.626 0.444
  ∑ PUFA 24.5 26.8 1.7 0.374 0.762
  ∑ trans-18:1 19.7 24.7 1.9 0.103 0.254
  ∑ BCFA3 17.1 16.0 0.81 0.347 0.346
  ∑ C164 380 280* 20.9 0.010 0.366
  ∑ de novo5 345 261* 21.4 0.021 0.947
  ∑ preformed6 282 301 13.9 0.358 0.291
Ratio
  c 9-14:1/14:0 0.86 0.55 0.10 0.060 1.000
  1. 1Treatment (Trt): cows in the control (CON) group (n = 10) received a control fat supplement, in which the CLA were substituted with stearic acid. Cows in the conjugated linoleic acid (CLA) group (n = 10) consumed 6 g/d each of trans-10,cis-12 CLA and cis-9,trans-11 CLA.
  2. 2Week of lactation; 3BCFA branched-chain fatty acids; 4C16 Sum of 16:0 and c 9-16:1.
  3. 5de novo: fatty acids <16 carbon atoms; 6preformed: fatty acids >16 carbon atoms.
  4. *Estimated mariginal means (EMMeans) are defined as significant (P < 0.05).