Document Detail

Improving the fatty acid profile of dairy cow milk by combining grazing with feeding of total mixed ration.
MedLine Citation:
PMID:  20196899     Owner:  NLM     Status:  MEDLINE    
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.
Ernesto Morales-Almaráz; Ana Soldado; Amelia González; Adela Martínez-Fernández; Ignacio Domínguez-Vara; Begoña de la Roza-Delgado; Fernando Vicente
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-03
Journal Detail:
Title:  The Journal of dairy research     Volume:  77     ISSN:  1469-7629     ISO Abbreviation:  J. Dairy Res.     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-04-12     Completed Date:  2010-07-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985125R     Medline TA:  J Dairy Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  225-30     Citation Subset:  IM    
Regional Institute for Agro-Food Research and Development (SERIDA), E-33300, Villaviciosa (Asturias), Spain.
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MeSH Terms
Animal Feed*
Animal Nutritional Physiological Phenomena
Fats / analysis*
Feeding Behavior
Lactation / metabolism*
Linoleic Acids, Conjugated / analysis*
Milk* / chemistry,  metabolism
Milk Proteins / analysis*
Oleic Acids / analysis*
Time Factors
alpha-Linolenic Acid / analysis*
Reg. No./Substance:
0/Fats; 0/Linoleic Acids, Conjugated; 0/Milk Proteins; 0/Oleic Acids; 143-25-9/11-octadecenoic acid; 463-40-1/alpha-Linolenic Acid

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