Factors affecting the content of ergosterol and zearalenone in selected grass species at the end of the growing season
2009
Skladanka, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Vyzivy Zvirat a Picninarstvi | Dohnal, V.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin | Dolezal, P.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Vyzivy Zvirat a Picninarstvi | Jezkova, A.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin | Zeman, L.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Vyzivy Zvirat a Picninarstvi
The objective of this study was to assess the safety of forage prepared from selected grass species by means of the analysis of ergosterol and zearalenone. Graminaceous plants studied at the end of their growing season were Festulolium, Dactylis glomerata and Arrhenatherum elatius. The intensity of grassland use in the summer season was also assessed. Grasslands were harvested either in October, November or December. The secondary metabolites were analyzed by means of HPLC. At the end of the growing season, the ergosterol conc. was the lowest in the Festulolium forage (110.04 mg/kg), whereas the highest conc. were observed in the Dactylis glomerata and Arrhenatherum elatius forages (145.73 mg/kg and 139.55 mg/kg, respectively). The safety of Festulolium was also corroborated by the low zearalenone conc. (0.357 mg/kg). On the other hand, the high ergosterol conc. in Arrhenatherum elatius was combined with a high conc. of zearalenone (1.554 mg/kg). Although Dactylis glomerata exhibited an ergosterol conc. comparable with that of Arrhenatherum elatius forage, its zearalenone conc. was comparable to the Festulolium forage. Changes in the ergosterol and zearalenone conc. were also apparent from October to December. The highest conc. of ergosterol was found in December (254.26 mg/kg). The higher zearalenone conc. in this month (1.588 mg/kg) was caused by the Arrhenatherum elatius forage. Moreover, the levels of both mycotoxins were significantly affected also by the number of cuts in summer. The high ergosterol conc. was not always correlated with the high zearalenone conc.
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