Occurrence of ectoparasiticides in Australian beef cattle feedlot wastes

Heather Coleman, Trang Trinh, Nhat Le-Minh, Marcus Klein, David J. Roser, Robyn W. Tucker, Richard M. Stuetz, Gregory Peters, Stuart J. Khan

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the simultaneous analysis of 6 ectoparasiticides – 2 synthetic pyrethroids (deltamethrin, cypermethrin) and 4 macrocyclic lactones (abamectin, doramectin, ivermectin and eprinomectin) in biosolids. The method was used to investigate the occurrence of these ectoparasiticides in beef cattle feedlot wastes in Australia from 5 commercial feedlot operations which employ varying waste management practices. Deltamethrin and cypermethrin were not detected in any of the samples while abamectin, ivermectin, doramectin and eprinomectin were detected in some of the samples with concentrations ranging from 1 to 36 μg/kg dry weight (d.w.) freeze dried feedlot waste. Levels of macrocyclic lactones detected in the feedlot wastes varied and were dependent on sample type. The effect of seasonal variations and waste management practices were also investigated in this study.
Original languageEnglish
Pages (from-to)265-272
JournalEnvironmental Pollution
Early online date2 Jan 2013
Publication statusPublished online - 2 Jan 2013


  • Macrocyclic lactones
  • Pyrethroids
  • Analysis
  • LC-MS/MS
  • Feedlot waste


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