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Background  Conjugated linoleic acids (CLA) are in focus of dairy cattle research because of its milk fat reducing effects. Little is known about the impact of CLA on immune function in dairy cows. Therefore, in the present study we investigated the effects of a long term supplementation of dairy cows with CLA on the fatty acid profile of peripheral blood mononuclear cells (PBMC) and their proliferation ex vivo.    Results  The supplementation of dairy cows with either 100 g/d of a control fat preparation (CON, n = 15), 50 g/d of the control fat preparation and 50 g/d CLA supplement – containing 12.0%  cis -9,  trans -11 and 11.9%  trans -10,  cis -12 CLA of total fatty acid methyl esters – (CLA-50, n = 15) or 100 g/d of the CLA supplement (CLA-100, n = 16) did not influence the major fatty acids (C18:0, C16:0,  cis -9 C18:1,  cis -9,  cis -12 C18:2,  cis -5, cis-8,  cis -11,  cis -14 C20:4) in the lipid fraction of PBMC. The proportion of  trans -10,  cis -12 CLA of total fatty acids was increased in both CLA supplemented groups, but there was no effect on the  cis -9,  trans -11 isomer. Furthermore, the proportion of  trans -9 C18:1 and  cis -12 C24:1 was reduced in the CLA-100 group. The mitogen stimulated cell proliferation was not influenced by CLA feeding.    Conclusion  CLA supplementation influenced the FA profile of some minor FA in PBMC, but these changes did not lead to differences in the mitogen induced activation of the cells.

Fatty acid profile and proliferation of bovine blood mononuclear cells after conjugated linoleic acid supplementation