Tackling the future challenges of Organic Animal Husbandry - vTI

! Agriculture and Forestry Research, Special Issue No 362 (Braunschweig, 2012) ISSN 0376-0723
Download: www.vti.bund.de/en/startseite/vti-publications/landbauforschung-special-issues.html
Results
Linseed supplementation had a highly significant impact on the fatty acid profile in milk with the
relative proportions of most fatty acids changing throughout the study (see Table 1).
Table 1. Fatty acids concentration in milk (means and standard errors of means - g per kg
total fatty acids); before, during and after linseed supplementation
376
before
2 n=2
Mean values Standard errors of mean ANOVA
during
2 n=28
after
2 n=12
before during after
values
3 Individual fatty acid
C4:0 16.9 24.6 24.0 1.4 1.6 2.3 ns
C6:0 22.6 23.3 23.6 1.0 0.2 0.5 ns
C8:0 14.3 14.0 14.6 0.7 0.1 0.3 ns
C10:0 34.4 a 30.7 b 34.1 a 0.1 0.2 0.2 ***
C12:0 40.6 a 32.2 c 37.1 b 0.1 0.3 0.6 ***
C14:0 122.9 a 107.5 c 113.7 b 0.6 0.7 0.8 ***
C14:1 9.1 7.3 8.0 0.1 0.4 0.2 ns
C15:0 13.7 a 11.0 b 12.3 a 0.2 0.2 0.2 ***
C16:0 351.2 a 289.1 b 334.2 a 4.1 1.8 3.3 ***
C16:1 c9 17.3 a 12.4 b 17.1 a 0.1 0.3 0.5 ***
C18:0 120.6 b 168.7 a 131.0 b 3.0 0.9 1.5 ***
OA 192.5 c 223.3 a 207.2 b 1.3 1.0 2.4 ***
VA 11.9 b 20.2 a 11.5 b 1.3 0.4 0.3 ***
LA 17.8 a 14.3 b 16.2 a 0.4 0.4 0.3 **
ALA 9.4 b 13.0 a 9.4 b 0.1 0.2 0.3 ***
CLA9 5.3 b 8.4 a 6.1 b 0.7 0.3 0.2 ***
Calculated fatty acid groups
4 SFA 769.0 a 736.8 b 756.3 a 3.0 1.2 2.4 ***
5 MUFA 231.0 b 263.2 a 243.8 b 3.0 1.2 2.4 ***
6 PUFA 32.4 b 35.7 a 31.7 b 0.4 0.4 0.4 ***
1 Significances were declared at ***: P < 0.001, ** : P < 0.01, ns: P > 0.10.
Means values in the same row with different letters are significantly different (P < 0.05) according to Tukey’s honestly
significant difference test.
2 n=number of samples
3 OA = C18:1 c9; VA = C18:1 t11; LA= C18:2 c9, 12; ALA= C18:3 c9, 12,15; CLA9= C18:2 c9t11
4 SFA: C4:0, C6:0, C8:0, C10:0, C12:0, C14:0, C16:0, C18:0, C20:0, C22:0, C24:0
5 MUFA: c9 C14:1, c9 C16:1, c9 C18:1 (OA), t11 C18:1 (VA), c11 C20:1
6 PUFA: c9c12 C18:2 (LA), c9c12c15 C18:3 (ALN), c9t11 C18:2 (CLA9), t10c12 C18:2, c8,c11,c14 C20:3,
c5c8c11c14 C20:4, c5c8c11c14c17 C20:5 , c13c16 C22:2, c7,c10,c13,c16,c19 C22:5
Short chain FA (C4, C6 and C8) and C14:1 were the only identified FA unaffected by supplementation.
In general mid-chain fatty acids and linoleic acid (LA) were depressed whereas a group of
longer chain, mostly unsaturated, fatty acids increased in concentration with linseed feeding, to the
extent that the start and end of supplementation can be identified in milk fat profiles in figure 1.
Discussion and conclusions
Despite relatively high levels of beneficial fatty acids in milk without supplementation at this farm,
these results agree with others who found linseed increased unsaturated FA in milk (Akraim et al.,
2007, Collomb et al., 2004, Fuentes et al., 2008, Gonthier et al., 2005, Hurtaud et al., 2010). The
greatest increase was seen in VA (+73 %) and CLA9 (+48 %), which is perhaps not surprising; they