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Lipids

, Volume 40, Issue 2, pp 191–202 | Cite as

A study on the causes for the elevated n−3 fatty acids in cows' milk of alpine origin

  • Florian Leiber
  • Michael Kreuzer
  • Daniel Nigg
  • Hans-Rudolf Wettstein
  • Martin Richard Leo Scheeder
Articles

Abstract

The influence of grass-only diets either from rye-grass-dominated lowland pastures (400 m above sea level) or botanically diverse alpine pastures (2000 m) on the FA profile of milk was investigated using three groups of six Brown Swiss cows each. Two groups were fed grass-only on pasture (P) or freshly harvested in barn (B), both for two experimental periods in the lowlands and, consecutively, two periods on the alp. Group C served as the control, receiving a silage-concentrate diet and permanently staying in the lowlands. Effects of vegetation stage or pasture vs. barn feeding on milk fat composition were negligible. Compared with the control, α-linoleic acid (18∶3n−3) consumption was elevated in groups P and B (79%, P<0.001) during the lowland periods but decreased on the alp to the level of C owing to feed intake depression and lower 18∶3n−3 concentration in the alpine forage. Average 18∶3n−3 contents of milk fat were higher in groups, P and B than in C by 33% (P<0.01) at low and by 96% (P<0.001) at high altitude, indicating that 18∶3n−3 levels in milk were to some extent independent of 18∶3n−3 consumption. The cis-9,trans-11 CLA content in milk of grass-fed cows was higher compared with C but lower for the alpine vs. lowland periods whereas the trans-11, cis-13 isomer further increased with altitude. Long-chain n−3 FA and phytanic acid increased while arachidonic acid decreased with grass-only feeding, but none of them responded to altitude. Grass-only feeding increased milk α-tocopherol concentration by 86 and 134% at low and high altitude (P<0.001), respectively. Changes in the ruminal ecosystem due to energy shortage or specific secondary plant metabolites are discussed as possible causes for the high 18∶3n−3 concentrations in alpine milk.

Keywords

Phytanic Acid Milk Yield Alpine Pasture Pasture Group Total Fame 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

18∶3n−3

α-linolenic acid

B

barn group

BHB

β-hydroxybutyrate

C

control group

CRC

controlled release alkane capsules

DM

dry matter

LS

least squares

NEFA

nonesterified FA

P

pasture group

SFA

saturated FA

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Copyright information

© AOCS Press 2005

Authors and Affiliations

  • Florian Leiber
    • 1
  • Michael Kreuzer
    • 1
  • Daniel Nigg
    • 1
  • Hans-Rudolf Wettstein
    • 1
  • Martin Richard Leo Scheeder
    • 1
  1. 1.Institute of Animal ScienceSwiss Federal Institute of Technology (ETH)ZurichSwitzerland

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