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Effects of fatty acid sources on conjugated linoleic acid (CLA) and other fatty acids in dairy milk

  • Nonthasak Piamphon (a1), Chalong Wachirapakorn (a1), Metha Wanapat (a1) and Chainarong Nawanukrow (a1)

Extract

Conjugated linoleic acid (CLA) is aniticarcinogenic, antiatherogenic and antidiabetogenic actives. Research has therefore focused on methods of increasing CLA content in milk fat. Amount of CLA in milk fat was highly related to biohydrogenation of unsaturated fatty acid of rumen microbes. (Bauman et al., 1999). Linoleic acid (C18:2) were the precursors of CLA synthesis. The CLA was also synthesized in the mammary gland of lactating ruminants, using oleic acid (C18:1) as a precursor and activity of delta 9-desaturase (Griinari and Bauman, 1999). Linoleic acid is high in soybean oil (SO) (54.4%) and tuna oil (TO) (20.3%) while oleic acid is high in pork oil (PO) (43.5%) and groundnut oil (GO) (40.7%). Therefore, the objective of this experiment was to compare the increasing of CLA and fatty acid composition in milk fat form cows fed dietary oils obtained from either animal or plant sources.

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Bauman, D.E., Baumgard, L.H., Corl, B.A. and Griinari, J.M. 1999. Biosynthesis of conjugated linoleic acid in ruminants.
Bauman, D.E., Baumgard, L.H., Corl, B.A. and Griinari, J.M. 1999. Biosynthesis of conjugated linoleic acid in ruminants. Proceedings of the American Society of Animal Science. (Available at: http://www.asas.org/jas/symposia/proceedings/0937.pdf Accessed July 2006.
Griinari, J.M. and Bauman, D.E. 1999. Biosynthesis of conjugated linoleic acid and its incorporation into meat and milk in ruminants. pages 180–200. In: Advances in Conjugated Linoleic Acid Research. Vol. 1. (Yurawecz, M.P, Mossaba, M.M, Kramer, J.K.G., Pariza, M.W., Nelson, G.J. (eds)). AOCS Press, Champaign, IL.
Hara, A. and Radin, N.S. 1978. Lipid extraction of tissues with a low-toxicity solvent. Analytical Biochemistry. 2007:420–426.

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