Dairy Science & Technology

, Volume 90, Issue 6, pp 687–698 | Cite as

Increasing pasture intakes enhances polyunsaturated fatty acids and lipophilic antioxidants in plasma and milk of dairy cows fed total mix ration

  • Stefania La Terra
  • Vita Maria Marino
  • Mario Manenti
  • Giuseppe Licitra
  • Stefania Carpino
Original article

Abstract

Polyunsaturated fatty acids and lipo-soluble vitamins in the milk are considered as neutraceutical compounds due to their beneficial effects on human health. The aim of the present study was to evaluate the changes in fatty acid composition and fat-soluble antioxidant content in plasma and milk from cows fed with different dietary proportions from pasture. Cows from a farm in the Hyblean mountain region in Italy were randomly divided into three groups (12 animals per group): CTRL fed only a total mix ration (TMR); 30P fed a TMR supplemented with 30% dry matter (DM) from pasture and 70P fed a TMR supplemented with 70% DM of pasture. Blood and milk samples were collected, stored and analysed for their content of fatty acids and fat-soluble antioxidants. Fatty acid profiles were significantly modified by different diets. CLA, vaccenic acid (VA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) significantly (P < 0.05) increased in plasma as a function of the proportion of pasture added to the diet. In agreement with these data, a progressively significant (P < 0.05) increase in concentrations of VA, CLA and EPA was observed in the milk. Such changes in fatty acid composition were accompanied by a concomitant increase in the concentrations of α-tocopherol and β-carotene in both plasma and milk. The increase in EPA, DHA and CLA, β-carotene and α-tocopherol in plasma may not only have a beneficial impact for milk and meat quality, but may also result in an increased protection against inflammatory events.

pasture plasma milk PUFA fat-soluble vitamins 

L’augmentation de la teneur en herbe de la ration améliore la teneur en acides gras polyinsaturés et en antioxydants lipophiles dans le plasma et le lait des vaches laitières en ration complète

Résumé

Les acides gras polyinsaturés (AGPI) et les vitamines liposolubles du lait sont considérés comme des composés nutraceutiques en raison de leurs effets bénéfiques pour la santé. Le but de cette étude était d’évaluer les changements de composition en acides gras et de teneur en antioxydants liposolubles dans le plasma et le lait de vaches laitières recevant différentes proportions de pâture. Les vaches provenant d’une ferme de la région du mont Iblei en Italie, ont été réparties aléatoirement en trois groupes (12 animaux par groupe) : un groupe témoin recevant une alimentation en ration complète (TMR); un groupe recevant une alimentation TMR supplémentée à hauteur de 30 % de matière sèche en herbe; un groupe recevant une alimentation TMR supplémentée à hauteur de 70 % de matière sèche en herbe. Des échantillons sanguins et du lait ont été collectés, conservés et analysés pour leur teneur en acides gras et en antioxydants liposolubles. Les profils en acides gras étaient modifiés de façon significative par les différents régimes. L’acide linoléique conjugué (CLA), l’acide vaccénique (VA), l’acide eisapentanoïque (EPA) et l’acide docohexanoïque (DHA) augmentaient significativement (P < 0,05) dans le plasma en fonction de la proportion de pâture. En accord avec ces résultats, une augmentation progressivement significative (P < 0,05) des concentrations en VA, CLA et EPA était observée dans le lait. De tels changements dans la composition en acides gras étaient accompagnés d’une augmentation concomitante des concentrations en α-tocophérol et en β-carotène à la fois dans le plasma et le lait. L’augmentation en EPA, DHA et CLA, α-tocophérol et β-carotène dans le plasma pourrait avoir un effet bénéfique en ce qui concerne non seulement la qualité du lait et de la viande, mais aussi de possibles effets contre les évènements inflammatoires.

pâture lait plasma acide gras polyinsaturé vitamine liposoluble 

Abstract

(PUFA) 3 12 (CTRL) (TMR); 30P (TMR) (DM) 70P (TMR) 70% (DM) (DM) (CLA), (VA), (EPA) (DHA) (P < 0.05) (VA), (CLA) (EPA) (P < 0.05) α- E β-(EPA) (DHA) (CLA) α- β-(CLA) n-3 PUFA

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Copyright information

© Springer S+B Media B.V. 2010

Authors and Affiliations

  • Stefania La Terra
    • 1
  • Vita Maria Marino
    • 1
  • Mario Manenti
    • 1
  • Giuseppe Licitra
    • 1
    • 2
  • Stefania Carpino
    • 1
  1. 1.CoRFiLaCRagusaItaly
  2. 2.DACPA Catania UniversityCataniaItaly

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