Increasing the milk quality with grazing feeding in humid Spain grassland

  1. Gonzalez Rodriguez A 12
  2. Roca-Fernandez A.I 12
  3. Vazquez-Yañez O 12
  4. Fernandez-Casado J. 34
  1. 1 1
  2. 2 Agrarian Research Centre of Mabegondo (CIAM)
  3. 3 2
  4. 4 Agrarian and Phytopathologic Laboratory (LAFIGA)
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Buch:
Grassland in a changing world

Verlag: European Grassland Federation

ISBN: 978-3-86944-021-7

Datum der Publikation: 2010

Seiten: 690-692

Art: Buch-Kapitel

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Zusammenfassung

The aim was to study the effect on milk fatty acids (FA) composition of three groups of cowswith different proportion of grazing (zero, 12 hr and 24 hr) having silage and concentrate (6.5kg cow-1) on the ration during the grazing season of sixty-one autumn-calving HolsteinFriesian dairy cows. Milk yield and quality, including the FA profile, were determined.Grazing 24-hr caused a significant decrease (P<0.05) in the saturated (SFA) and a significantincrease in the unsaturated (UFA) fatty acids. The conjugated linoleic acid (CLA) showed asignificantly increase (P<0.05) with grazing time, from 4.8, 8.4 and 11.7 g kg-1 of FA in milkfat for the silage feeding, 12-hr or 24-hr grazing, respectively during the spring. Farmers fromthe humid part of Spain, producing milk from grazed grass, might get a benefit in milk price ifFA composition of milk is taken into account in the dairy industry. We found that milk fromgrazing dairy cows had a higher proportion of unsaturated FA, and more polyunsaturated FAand CLA than milk from silage-fed cows, in the sustainable dairy systems proposed to reducethe intensiveness of milk production.