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The likelihood of disease depends on the age of the lambs when
the larvae hatch. In a mild spring, hatching occurs when the lambs
are too young to graze sufficient grass and larvae. In a cold spring,
the lambs are over 12 weeks and immune.
If your lambs are grazing where last year’s lambs scoured in
May/June, then you will probably have problems this year. If you
can’t avoid these pastures, don’t wait until the lambs
start scouring—the damage is already done! Drenching the lambs
three times over the two months with a white drench, levamisole
or Oromec should do the trick. Oral Cydectin will work but, as it
doesn’t have a persistence against Nematodirus, it’s an
expensive option. Don’t use Avermectin injections as they don’t
work.
If your lambs still scour, submit faeces samples to us to rule out
coccidiosis.
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Flock Check
Up to the end of July, Intervet are offering a free blood test of
ewes that aborted this year. This will detect antibodies to toxoplasmosis
and enzootic abortion.
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