The most recent version of this monthly parasite forecast may be accessed at www.nadis.org.uk. SHEEP NEMATODES: Peak pasture larval availability usually occurs in July or August. This peak primarily consists of larvae developing from eggs passed by lambs. The lambs passing these eggs were themselves infected by larvae originating from the ewes during the peri-parturient rise (PPR) or by overwintered larvae. The magnitude of the peak will therefore be lower where ewes and lambs were turned out onto pastures with a very low larval population. Prolonged cool conditions may delay this peak, and July temperatures are forecast to be around or below average this year. Extended dry spells may also delay the pasture larval peak, which may occur anywhere depending on local weather conditions. Forecasts suggest these conditions may occur in places this year.
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