Current conditions while good for grass growth, are creating issues with the wool on the sheep’s back.
I have observed cases of dermatitis and the condition referred to as ‘Lumpy Wool’ or Dermatophilosis in several ewe flocks. The bacteria involved in this problem loves a damp, humid environment and spreads rapidly from sheep to sheep in damp, wet conditions especially during yarding. From the initial small scabby lesions, if untreated, the problem grows to form large crusty areas in the wool especially over the back line. These lesions, as well as affecting wool quality, are extremely attractive to fly and will shorten the length of protection after dipping as they do not contain the dip chemicals that have been applied.
Shearing helps to alleviate the problem in longer woolled ewes. The condition can be controlled / treated by applying zinc sulphate through spray races, dips, etc as a 2-3% solution (2-3kgs / 100litres of water).
If you have noted this problem and are re-dipping ewes, the use of zinc sulphate should be seriously considered both to treat the obvious infections and sub-clinical infections and also to prevent spreading to unaffected ewes. In badly affected flocks, zinc sulphate treatment also may be warranted, even if dipping is not necessary.
If you would like further information on this problem please contact the Clinic.