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Feeding heat-oxidized oil to dairy cows affects milk fat nutritional quality

Published online by Cambridge University Press:  22 June 2017

M. Kaleem ,
F. Enjalbert ,
Y. Farizon  and
A. Meynadier
M. Kaleem
Affiliation:
GenPhySE, Université de Toulouse, INRA, INPT, ENVT, F-31326 Castanet Tolosan, France
F. Enjalbert
Affiliation:
GenPhySE, Université de Toulouse, INRA, INPT, ENVT, F-31326 Castanet Tolosan, France
Y. Farizon
Affiliation:
GenPhySE, Université de Toulouse, INRA, INPT, ENVT, F-31326 Castanet Tolosan, France
A. Meynadier*
Affiliation:
GenPhySE, Université de Toulouse, INRA, INPT, ENVT, F-31326 Castanet Tolosan, France
*
† E-mail: a.meynadier@envt.fr
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Abstract

Heating oil and oilseeds results in oxidation products that affect ruminal biohydrogenation of polyunsaturated fatty acids, altering milk fatty acids profile, and could be transferred to milk. An experiment was conducted to investigate the effects of oil heating on rumen and milk fatty acids profile and the transfer of oxidation products to milk. Sunflower oil was heated at 150°C for 15 h and given to lactating dairy cows in a 2×2 arrangement: two groups of two cows, equipped with a ruminal cannula and receiving two diets (containing either heated or unheated oil) during two experimental periods. Oil heating generated hydroperoxides and/or hydroxyacids and aldehydes, in particular trans-2,trans-4-decadienal. In milk, heated oil only significantly decreased trans-11-C18:1 and cis-9,trans-11-CLA percentage compared to non-heated oil, and slightly increased cis-9,cis-12-C18:2 percentage, which was probably linked to an inhibition of the ruminal Δ12 isomerase by oxidative products in the rumen. However, feeding highly oxidized oil did not result in the appearance of hydroperoxides or hydroxyacids in milk and did not increase milk aldehydes content.

Keywords

trans fatty acidslipid oxidation productsrumenbiohydrogenationmilk quality
Type
Research Article
Information
animal , Volume 12 , Issue 1 , January 2018 , pp. 183 - 188
Copyright
© The Animal Consortium 2017 

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