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The infl uence of diets enriched in 2% CLA isomer mixture (as CLAmixA or CLAmixB) and/or Se as selenate (SeVI) or selenized yeast (Se-Y) on the concentration of fatty acids (FA) and amino acids (AA) in the liver and femoral muscles was studied on 8 groups of 7-8 rats aged 8 weeks. Rats were fed a basal diet for 29 days or diets enriched with two combinations of 2% CLAmixA with/without 2 ppm Se (as SeVI) or 2% CLAmixB with/without 1.2 ppm Se (as Se-Y). The dietary CLAmixB containing the higher concentration of trans10cis12CLA (t10c12CLA) resulted in a higher decrease of body weight gain (BWG) (P<0.1) than the dietary CLAmixA with the lower concentration of t10c12CLA. The diet enriched in SeVI reduced the BWG (P<0.05) in rats. The dietary CLAmixA lowered the concentration of saturated FA (SFA), atherogenic SFA and thrombogenic SFA in the liver and muscles. The value of the Δ9-desaturase index decreased in the liver and muscles of rats fed the diet enriched in CLAmixA or CLAmixB compared with that in the control rats. There were signifi cantly higher (P<0.01) concentrations of c9t11CLA, t10c12CLA, ccCLA and ttCLA in the muscles compared with the concentrations of these isomers in the liver of rats fed the diets enriched in CLAmixA or CLAmixB, regardless the presence of extra Se as Se VI or Se-Y. The ratio (Rt10c12/c9t11) of t10c12CLA and c9t11CLA in the liver and muscles of rats fed the diets enriched in CLA isomers was, regardless of the presence of Se, smaller compared with the values of Rt10c12/c9t11 in the dietary CLA isomers. The concentrations of CLA isomers tended to or signifi cantly increased in the liver and muscles of rats fed diets containing Se and CLA isomers compared with rats fed the diets enriched in CLA isomers. The concentrations of PUFAn-3, PUFAn-6, PUFA and the ratio of PUFA/SFA decreased in the muscles of rats fed the diet with CLAmixA. The results suggest that the dietary CLAmixA containing the higher concentration of ttCLA, regardless of the presence of SeVI, more effi ciently reduced the magnitude of lipoprotein synthesis in muscles than the diet containing CLAmixB with/without Se-Y, Journal of Animal and Feed Sciences, 16, 2007, 678–695 * Supported in part by the Ministry for Science and Information, Grant No. 2 P06Z 016 29 1 Corresponding author: e-mail: m.czauderna@ifzz.pan.pl 679 CZAUDERNA M. ET AL. while dietary Se-Y most effectively reduced the anti-obesity properties of CLA isomers in rats. The diets enriched in CLA isomers (as CLAmixA or CLAmixB), regardless of the presence of Se VI, led to a decrease in the concentration of methionine (Met) in the liver and the concentration of all amino acids in the muscles, while increasing the concentration of Met in muscles.

journal of animal and feed sciences

Comparison of the influence of different chemical forms of selenium and the profiles of CLA isomers in the diet on the fatty acid and amino acid contents in the liver and femoral muscles of rats