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Grazing increases the concentration of CLA in dairy cow milka

Published online by Cambridge University Press:  30 April 2014

M. N. Lahlou ,
R. Kanneganti ,
L. J. Massingill ,
G. A. Broderick ,
Y. Park ,
M. W. Pariza ,
J. D. Ferguson  and
Z. Wu
M. N. Lahlou
Affiliation:
US Dairy Forage Research Center, USDA-ARS, Madison, WI 53706, USA
R. Kanneganti
Affiliation:
US Dairy Forage Research Center, USDA-ARS, Madison, WI 53706, USA
L. J. Massingill
Affiliation:
US Dairy Forage Research Center, USDA-ARS, Madison, WI 53706, USA
G. A. Broderick
Affiliation:
US Dairy Forage Research Center, USDA-ARS, Madison, WI 53706, USA
Y. Park
Affiliation:
Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA
M. W. Pariza
Affiliation:
Food Research Institute, University of Wisconsin, Madison, WI 53706, USA
J. D. Ferguson
Affiliation:
New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348, USA
Z. Wu*
Affiliation:
New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348, USA
*
†E-mail: zwu@vet.upenn.edu
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Abstract

An experiment was conducted to examine whether increased CLA in milk of dairy cows fed fresh pasture compared with alfalfa and corn silages was because of ruminal or endogenous synthesis. Eight Holsteins were fed a total mixed ration using alfalfa and corn silages as the forage source in confinement or grazed in a replicated crossover design. The proportion of total fatty acids as CLA (primarily c9, t11-18:2) in g/100 g was 0.44 v. 0.28 in ruminal digesta, 0.89 v. 0.53 in omasal digesta and 0.71 v. 1.06 in milk during confinement feeding and grazing, respectively. Blood plasma CLA was 0.54 v. 1.05 mg/l for the two treatments, respectively. The increased concentration of CLA in milk with grazing likely resulted from increased synthesis through desaturation of t11-18:1 in the mammary gland.

Keywords

CLApasturemilk fatty acidsdairy cow
Type
Full Paper
Information
animal , Volume 8 , Issue 7 , July 2014 , pp. 1191 - 1200
Copyright
© The Animal Consortium 2014 

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