title: Occurrence of ectoparasiticides in Australian beef cattle feedlot wastes.
abstract: 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.
authors.affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, NSW 2052, Australia. h.coleman@unsw.edu.au
authors.forename: Heather M
authors.initials: HM
authors.lastname: Coleman
authors.forename: Trang
authors.initials: T
authors.lastname: Trinh
authors.forename: Nhat
authors.initials: N
authors.lastname: Le-Minh
authors.forename: Marcus
authors.initials: M
authors.lastname: Klein
authors.forename: David J
authors.initials: DJ
authors.lastname: Roser
authors.forename: Robyn W
authors.initials: RW
authors.lastname: Tucker
authors.forename: Richard M
authors.initials: RM
authors.lastname: Stuetz
authors.forename: Gregory
authors.initials: G
authors.lastname: Peters
authors.forename: Stuart J
authors.initials: SJ
authors.lastname: Khan
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000977:Antiparasitic Agents / Q000032:analysis*; D001315:Australia; D002417:Cattle; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D004787:Environmental Pollution / Q000706:statistics & numerical data; D005243:Feces / Q000737:chemistry
chemical_list: D000977:Antiparasitic Agents; D004785:Environmental Pollutants