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the contents of trans fatty acids and cla in cow colostrum and milk fat in the early lactation period

Author

Listed:
  • Beata Paszczyk

    (Chair of Instrumental Analyses, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland)

  • Zofia Żegarska

    (Chair of Instrumental Analyses, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland)

  • Zbigniew Borejszo

    (Chair of Instrumental Analyses, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland)

Abstract

The trans fatty acids as well as cis-9 trans-11 C18:2 (CLA) were determined in the colostrum and milk fat of individual cows during up to 82 days of lactation. The analyses were performed using gas chromatography (GLC) on a capillary column (CP Sil 88) combined with the method of argentation thin-layer chromatography (Ag-TLC). The results obtained in the study indicated that the milk fat of individual cows, kept under identical living and feeding conditions, was characterised by an extremely high variability of trans isomers concentration, especially of those of C18:1 acid. The differences referred not only to the total content of trans C18:1 isomers but also to the proportion of trans-10 and trans-11 isomers of C18:1. In some fat samples, a high concentration of trans C18:1 isomers was observed and trans-10 isomer of C18:1 was found to dominate. In the case of all the cows, the colostrum fat was characterised by a lower average content of the examined acids as compared to the milk fat. The average value of CLA in the colostrum fat of all the cows under study was 0.34%, and in the milk fat 0.42% of total fatty acids.

Suggested Citation

  • Beata Paszczyk & Zofia Żegarska & Zbigniew Borejszo, 2005. "the contents of trans fatty acids and cla in cow colostrum and milk fat in the early lactation period," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 23(4), pages 159-165.
    • Handle: RePEc:caa:jnlcjf:v:23:y:2005:i:4:id:3386-cjfs
    DOI: 10.17221/3386-CJFS
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