Frosts means last summer and Fluke drench.

After three or four frosts, it is time to treat the sheep that have been grazing the wet areas over summer, for liver fluke. At the same time we will give all sheep a final drench before winter. We do this when we take the Rams out of the breeding ewes, they will have had two oestrus cycles, ( 34 days ),  any sheep not in lamb after this will be culled. Fertility is the most important economic trait in any breeding enterprise.
We had five breeding groups this year, will put them together , and after two weeks a cleanup ram will go in to join the culls.( as above)