Improving the fatty acid profile of dairy cow milk by combining grazing with feeding of total mixed ration

Grazing cows could produce milk with a higher proportion of polyunsaturated fatty acids, which is beneficial to human health, compared with non-grazing cows, though grazing alone could compromise milk production. Under oceanic climate conditions, a study involving 15 dairy cows, fed total mixed rati...

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Bibliographic Details
Published in:Journal of dairy research 2010-05, Vol.77 (2), p.225-230
Main Authors: Morales-Almaráz, Ernesto, Soldado, Ana, González, Amelia, Martínez-Fernández, Adela, Domínguez-Vara, Ignacio, de la Roza-Delgado, Begoña, Vicente, Fernando
Format: Article
Language:English
Subjects:
alpha-Linolenic Acid - analysis
Animal Feed
Animal Nutritional Physiological Phenomena
Animal productions
Animals
Biological and medical sciences
Cattle
Climate
Climatic conditions
Conjugated linoleic acid
Dairy cattle
dairy cow
Dairying
Fats - analysis
Feeding Behavior
Female
Food industries
Fundamental and applied biological sciences. Psychology
Grazing
grazing time
Lactation - metabolism
Linoleic Acids, Conjugated - analysis
Milk - chemistry
Milk - metabolism
Milk and cheese industries. Ice creams
milk fatty acid
Milk production
Milk Proteins - analysis
Oleic Acids - analysis
Pasture
Polyunsaturated fatty acids
Terrestrial animal productions
Time Factors
Total mixed rations
Vertebrates
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Summary:Grazing cows could produce milk with a higher proportion of polyunsaturated fatty acids, which is beneficial to human health, compared with non-grazing cows, though grazing alone could compromise milk production. Under oceanic climate conditions, a study involving 15 dairy cows, fed total mixed ration (TMR) ad libitum in combination with different grazing times of 12 h (TMR12), 6 h (TMR06) and zero grazing time (TMR00) with the aim to evaluate different strategies on the fatty acids profile of milk and milk production. No differences were seen between the treatments with respect to milk yield (34·4±6·3 kg/d) or milk protein content (30·4±1·8 g/kg). The milk produced by the TMR12 cows had less total fat (36·2 vs. 38·2 g/kg) and saturated fatty acid (FA, 69·39 vs. 71·44 g/100 g FA) than that produced by the TMR00 cows. The concentration of vaccenic acid in the TMR06 and TMR12 milk was twice that of the TMR00 milk (4·22, 4·09 and 2·26 g/100 g FA respectively). Linear increases in conjugated linoleic (CLA) and linolenic acids were observed with increasing grazing time. Pasture was an important source of FA especially C18:3 for TMR06 and TMR12 cows. Under oceanic climatic conditions, the grazing of dairy cows as a complement to feeding with TMR can improve the FA profile of milk and increase its CLA content.
ISSN:0022-0299
1469-7629
DOI:10.1017/S002202991000004X