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Associations between concentrations of fat and intermediates of ruminal biohydrogenation in milk of dairy cows

Published online by Cambridge University Press:  05 November 2021

J.R. Newbold ,
K.L. Robertshaw  and
H.W. Morris
J.R. Newbold
Affiliation:
BOCM PAULS LTD, 47 Key Street, Ipswich IP4 1BX, United Kingdom
K.L. Robertshaw
Affiliation:
BOCM PAULS LTD, 47 Key Street, Ipswich IP4 1BX, United Kingdom
H.W. Morris
Affiliation:
BOCM PAULS LTD, 47 Key Street, Ipswich IP4 1BX, United Kingdom
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Extract

Rumen bacteria convert polyunsaturated C18 fatty acids to stearic acid (CI8:0) by biohydrogenation. Intermediates include a family of cis/trans isomers of linoleic acid known as conjugated linoleic acid (CLA) and a family of trans isomers of oleic acid (C18:1), chiefly trans-11 C18:1. Trans fatty acids inhibit milk fat synthesis in cows, an effect which Griinari et al. (1997) attributed specifically to trans-10 C18:1. Biohydrogenation intermediates can be incorporated directly into milk. In humans, trans C18:1 in hydrogenated vegetable oil (chiefly trans-9 C18:1) mimic saturated fatty acids as a risk factor for heart disease (Judd et al., 1994) and may inhibit milk fat synthesis. CLA may be anticarcinogenic (Parodi, 1997). It is important, therefore, to understand the effect of dairy cow nutrition on biohydrogenation intermediates.

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Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 224
Copyright
Copyright © The British Society of Animal Science 1998

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References

Griinari, J.M., Nurmela, K.V.V. and Bauman, D.E. (1997). Trans-10 isomer of octadecenoic acid corresponds with milk fat depression. Journal of Dairy Science (Suppl. 1) 80: 204.Google Scholar
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