ORIGINAL PAPER
Dietary selenized yeast and CLA isomer mixture affect
fatty- and amino acid concentrations in the femoral
muscles and liver of rats
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1
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences
05-110 Jabłonna, Poland
2
Institute of Animal Physiology, Slovak Academy of Sciences,
040 01 Košice, Slovak Republic
Publication date: 2009-03-20
Corresponding author
M. Czauderna
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences
05-110 Jabłonna, Poland
J. Anim. Feed Sci. 2009;18(2):348-361
KEYWORDS
ABSTRACT
The effect of diets enriched in CLA isomer mixture (CLAmix) and/or selenized yeast
(Se-Y) on the concentration of fatty acids (FA), amino acids (AA), Se, Fe and Zn in the liver and
femoral muscles was studied on 4 groups of 7-8 rats aged 8 weeks. Rats were fed the Labofeed H
diet for 29 days (control group) or the diet enriched with 2% CLAmix with or without 1.2 ppm Se
as Se-Y (the experimental groups). Feeding the CLAmix-enriched diet reduced the body weight of
rats, while the diet containing CLAmix and Se-Y increased it in comparison with the control rats.
The muscle concentrations of non-essential and essential amino acids, and in particular, sulphur
amino acids (ΣS-AA) can be significantly increased, while the muscle concentration of total
fatty acids (ΣFA), decreased by feeding the diet with Se-Y and CLAmix. Feeding the diet with
Se-Y leads to significant lowering of the ratios of ΣS-AA, methionine, cysteine and taurine to Se
concentrations in the liver and muscles as compared with the control group. Dietary Se-Y or CLAmix
lead to a decrease in the concentrations of atherogenic and thrombogenic saturated fatty acids (SFA)
in muscles. Feeding the diet with Se-Y and CLAmix increased the concentration of Se and the
atherogenic and thrombogenic indexes in the liver and muscles. There were also higher concentrations
of cis9trans11CLA and t10c12CLA in the muscles compared with the concentrations of these isomers
in the liver of rats fed the diets enriched in only CLAmix. Deposition in the liver and femoral muscle
of trans10cis12CLA was higher in both tissues than cis9trans11CLA. The diet with CLAmix,
regardless of the presence of Se-Y, decreased the rate of elongation and Δ5-, Δ9-desaturase capacities
of in the liver and muscle. The diet with CLAmix effectively increased the ratio of PUFAn-3/SFA, PUFAn-6/SFA, PUFAn-3/ΣFA and PUFAn-6/ΣFA in muscles. The interaction between Se-Y and
CLAmix decreased the capacity of liver and muscle desaturation, i.e. these dietary additives reduced
the ratio of unsaturated fatty acids to SFA in the liver and muscles.
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