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Management of the Environmental Inputs and Risks of Cypermethrin-based Sheep Dips - VM02504

Description
Sheep can suffer from a number of skin parasites that cause ill health and suffering, thus it is essential to prevent and control such infections. Dipping is the most effective method to treat a wide range of parasites , but there have been many pollution incidents over the past few years involving cypermethrin that have been thought to result from the use of sheep dips. Consequently, the market authorisation for cypermethrin-based sheep dips was suspended in February 2006.

Environment Agency investigations indicate a number of potential routes of exposure, including: 1) cypermethrin contained in runoff from hard surfaces within the farmyard, and 2) removal from the fleece when sheep enter streams. The current guidelines advise that sheep should be kept away from water courses for at least 2 weeks after dipping “where possible”, thus acknowledging that this is not always practical. However, even after 2 weeks sheep dip product may remain on the fleece.

Two recent exploratory studies, funded by VMD and the EA, have demonstrated that these two exposure routes do indeed have the potential to cause pollution incidents. However the data from these studies (most notably the fleece washoff studies) are not currently suitable to make risk management decisions. There is now an urgent need to further explore these routes of exposure and to explore potential risk management options.

The overall aim of the study is therefore to further investigate the environmental risks arising the use of cypermethrin-based sheep dips. Experimental and desk-based studies will therefore be performed to: 1) Develop an understanding of post-dip sheep handling practices; 2) Further investigate the potential inputs of cypermethrin from sheep fleece over time; 3) Assess the potential risks of inputs of cypermethrin from runoff arising from hard surfaces and from washoff from the fleece/hooves; 4) Explore approaches for reducing inputs of cypermethrin to the aquatic environment; and 5) Propose possible risk management options for controlling the releases of cypermethrin from sheep dip to surface waters.
Objective
The overall aim of the study is to further investigate the environmental risks arising the use of cypermethrin-based sheep dips. The specific objectives are to:

1. Develop an understanding of post-dip sheep handling practices
2. Further investigate the potential inputs of cypermethrin from sheep fleece over time
3. Assess the potential risks of inputs of cypermethrin from runoff arising from hard surfaces and from washoff from the fleece/hooves
4. Explore approaches for reducing inputs of cypermethrin to the aquatic environment
5. Propose possible risk management options for controlling the releases of cypermethrin from sheep dip to surface waters
Project Documents
• Final Report : Management of the environmental inputs and risks of cypermetrhin -based sheep dips   (423k)
• Final Report - SID5A : Management of the environmental inputs and risks of cypermetrhin -based sheep dips   (177k)
Time-Scale and Cost
From: 2007

To: 2008

Cost: £97,745
Contractor / Funded Organisations
Central Science Laboratory
Keywords
Agriculture and Water Quality              
Animal Welfare              
Environmental Protection              
Livestock Farming              
Parasites              
Pollution              
Sheep Dipping              
Sheep Scab              
Water Pollution              
Fields of Study
Animal Health
Veterinary Medicine