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Variations des teneurs en micronutriments de l'herbe des prairies de moyenne montagne et transfert au lait

Abstract : Carotenoids, vitamins and phenolic compounds present in milk contribute to its nutritional value. Their levels widely depend on the compositionof ingested grass, but how exactly does the botanical diversity of mountain grassland affect these levels? Changes, over the pasturing season, in carotenoid, tocopherol and polyphenol levels was studied in medium altitude grassland forage with a diversified vegetation (under experimental conditions or on farms with varied pasture practices) and in the milk produced by cows, grazing on this grassland. The following observations were made i) an inverse evolution between the stage of development of forage grass species and carotenoid levels and ii) grassland with a lower botanical diversity used in a more intensive way has higher carotenoid levels but lower polyphenol levels. However, these differences in the nutritional value of forage do not necessarily result in a difference in milk concentration.
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Benoit Graulet, Mathilde Piquet, Beatrice Duriot, Philippe Pradel, Sophie Hulin, et al.. Variations des teneurs en micronutriments de l'herbe des prairies de moyenne montagne et transfert au lait. Fourrages, Association Française pour la Production Fourragère, 2012, 209, pp.59-68. ⟨hal-02646114⟩

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