Horton B J, Best D J, Butler L G, Gregory G G
Aust Vet J. 1997 Jul;75(7):500-3. doi: 10.1111/j.1751-0813.1997.tb14382.x.
To investigate wool organophosphorus concentrations resulting from a range of farm pesticide application methods.
Random sampling of wool for pesticide residues and on-farm interviews to determine associated treatments.
Tasmanian fleece wool lots were sampled at random and tested for organophosphorus residues. The grower was identified and the pesticide treatments applied to the sheep were ascertained by on-farm interview.
The residue concentrations showed a large variation that was not accounted for by differences in treatments by growers. Organophosphorus concentrations were proportional to the number of treatments applied, and inversely related to the time between pesticide application and the subsequent shearing, and were significantly influenced by the method of application. After allowing for the time of application, plunge dipping resulted in pesticide residue concentrations 2 to 2.5 times greater than shower dipping, using spray races or hand jetting, and the use of these methods caused larger residues than the use of jetting races.
We recommend that plunge or shower dipping should not be used more than 7 weeks after shearing, nor at higher concentration than the standard dose rate used for lice control, whereas jetting may be satisfactory for up to 7 months after shearing, provided only one application is administered.
研究一系列农场农药施用方法导致的羊毛有机磷浓度。
对羊毛进行随机抽样以检测农药残留，并在农场进行访谈以确定相关处理方式。
随机抽取塔斯马尼亚羊毛批次，检测有机磷残留。确定养殖者身份，并通过农场访谈确定对绵羊施用的农药处理方式。
残留浓度差异很大，养殖者处理方式的不同并不能解释这种差异。有机磷浓度与施用处理次数成正比，与施用农药至随后剪毛之间的时间成反比，且受施用方法的显著影响。考虑到施用时间后，药浴导致的农药残留浓度比喷淋药浴、使用喷雾通道或手动喷射高出2至2.5倍，且使用这些方法产生的残留量比使用喷射通道更大。
我们建议，药浴或喷淋药浴不应在剪毛后超过7周进行，浓度也不应高于用于防治虱子的标准剂量率，而喷射在剪毛后长达7个月内可能是合适的，前提是只进行一次施用。
