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

Published online by Cambridge University Press:  03 March 2010

Ernesto Morales-Almaráz ,
Ana Soldado ,
Amelia González ,
Adela Martínez-Fernández ,
Ignacio Domínguez-Vara ,
Begoña de la Roza-Delgado  and
Fernando Vicente
Ernesto Morales-Almaráz
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
Ana Soldado
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
Amelia González
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
Adela Martínez-Fernández
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
Ignacio Domínguez-Vara
Affiliation:
FMVZ-UAEM, Autonomous University of State of México, 50090Toluca, Mexico
Begoña de la Roza-Delgado
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
Fernando Vicente*
Affiliation:
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain
*
*For correspondence; e-mail: [email protected]
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Abstract

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.

Keywords

Conjugated linoleic acidgrazing timemilk fatty aciddairy cow
Type
Research Article
Information
Journal of Dairy Research , Volume 77 , Issue 2 , May 2010 , pp. 225 - 230
Copyright
Copyright © Proprietors of Journal of Dairy Research 2010

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