asked Her Majesty's Government:What is the recommended period of time between dipping sheep in organophosphorus or synthetic pyrethroid sheep dips and "crutching" of the animals by professional shearers prior to slaughter. [HL1307]

There is no specific recommended period of time between dipping sheep and "crutching" (removing the fleece around the posterior) prior to slaughter. However, the Sheep Dipping Leaflet AS29 rev2 recommends that:

"in the weeks that follow dipping, dip residues remain on the sheep. If you have to handle them, wear coveralls and wellington boots. It is also good practice to wear good quality synthetic rubber disposable gloves. If the sheep are wet you should also wear waterproof trousers and coat."

The Health and Safety Executive advise that the use of such personal protective equipment would be feasible for an operation such as crutching.