National Animal Disease Information Service (NADIS) Parasite...
Transcript of National Animal Disease Information Service (NADIS) Parasite...
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National Animal Disease Information Service
(NADIS)
Parasite Forecast
April 2013
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About this webinar
• The parasite forecast is published monthly
and written by specialist veterinary surgeons
• Based on detailed Met office data
• Sponsored by Merial Animal Health
• Supported by EBLEX, HCC and QMS
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Meteorological Data
Temperature
Rainfall
REGIONS
0 N W Scotland
1 E Scotland
2 N E England
3 E Anglia
4 The Midlands
5 S England
6 S W Scotland
7 N W England
& N Wales
8 S W England
& S Wales
9 N Ireland
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Temperature Rainfall Above/below regional averages (1961-1990)
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Disease Focus:
Nematodirus
Life cycle
Key facts
Control
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Development
to worms in
abomasum
Eggs
passed in
dung
Develop
to L3
larvae
Infective L3
migrate up
grass blades
Grazing
lambs ingest
L3 larvae
Nematodirus:
Life Cycle
~15 days
but
delayed if
cold
10-12 days
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Nematodirus: Key Facts
May and June usually see the greatest
amount of disease
Clinical signs include profuse diarrhoea
Disease is mainly caused by worm larvae
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Nematodirus: Control
• Avoid grazing lambs on pasture used for
young lambs in the previous year
• If not possible, early lambs may require
drenching before the end of April
• Use BZ (group 1) products
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Parasitic
Gastroenteritis (PGE)
Risks
Treatment
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PGE: Risk • Overwintered larvae picked up by late
pregnant or lactating ewes
• Egg development will be quicker as temperatures increase through March/April
– Eggs passed by ewes maintains infectivity of the pasture
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PGE: Treatment
• Target treatments to
thinner or multiple
bearing ewes
• Leave at least 10% of
the flock un-treated!
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Other diseases
Coccidiosis
Chronic liver fluke
Cattle nematodes
Tick-borne fever
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Coccidiosis • Significant risk in April
• Adverse weather
conditions cause:
– Poor colostrum
– Poor grass growth
– Extended housing
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Chronic Liver Fluke
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Cattle Nematodes • Dairy calves and autumn-born suckler calves will need
treatment in 1st season unless on safe grazing – Or ‘dose and move’ at mid-summer
– Lungworm is best controlled using vaccination (‘Huskvac’)
• Worm problems are usually greater in wet summers – but Autumn disease can be seen following a dry summer
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Ectoparasites: Ticks • ‘Tick-borne fever’ transmitted by ticks
• Abortion in pregnant ewes
• Secondary infections in young lambs
– This ‘tick pyaemia’ causes abscesses
– Control ticks using pour-on acaricides before lambs go on to contaminated pastures
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• Tick pyaemia can
cause:
– Paralysis
– Joint ill
– Abscesses under
the skin
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Questions
• Please click on the link below to answer a
short quiz and print your Advanced
Livestock Skills certificate