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Multivariate modelling of milk fatty acid profile to discriminate the forages in dairy cows’ ration
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Multivariate modelling of milk fatty acid profile to discriminate the forages in dairy cows’ ration
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Journal Article
Multivariate modelling of milk fatty acid profile to discriminate the forages in dairy cows’ ration
2021
Overview
Although there are many studies on the importance of fatty acids (FA) in our diet and on the influence of dairy diets on FA metabolism, only a few investigate their predictive capacity to discriminate the type, amount and conservation method of farm forages. This research quantifies differences in milk FA concentrations and, using a supervised factorial discriminant analysis, assesses potential biomarkers when replacing maize with other silages, grass/lucerne hays or fresh grass. The statistical modelling identified three main clusters of milk FA profiles associated with silages, hays and fresh grass as dominant roughages. The main implication of a dairy cow feeding system based on poliphytic forages from permanent meadows is enhancing milk’s nutritional quality due to an increase in beneficial omega-3 polyunsaturated FA, conjugated linoleic acids and odd chain FA, compared to feeding maize silage. The study also identified a small but powerful and reliable pool of milk FA that can act as biomarkers to authenticate feeding systems: C16:1
c
-9, C17:0, C18:0, C18:3
c
-9,
c
-12,
c
-15, C18:1
c
-9, C18:1
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-11 and C20:0.
