Effect of feeding system on cow milk fatty acids composition in a panel of Galician dairy farms

Bijeenkomst: EGF2015
Auteur: Resch-Zafra C., Pereira-Crespo S., Flores-Calvete G., Dagnac T., Gónzalez L., Agruña M.J., Fernández-Lorenzo B. and Veiga M.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
Sixty farms located in the Galicia region (NW Spain) were sampled four times during 2012 and samples of ration ingredients and bulk-tank milk were taken with the objective of studying the relationships between dairy cow ration and the fatty acid (FA) composition of the milk. Diets were grouped into five clusters based on ration ingredients and significant differences among clusters were observed for saturated, polyunsaturated, omega-3 and conjugated linoleic fatty acids, as well as for the omega6- omega3 ratio. In general, milk from grazing extensive systems and from intensive systems based on silage and concentrates supplemented with extruded linseed showed the highest contents of human-health FA. The ability of FA-based discriminant functions for assigning farm tank milk samples to a particular diet was deemed as not satisfactory.