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Sheep Disease Schemes

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Sheep Disease Schemes – PowerPoint PPT presentation

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Title: Sheep Disease Schemes


1
Sheep Disease Schemes
  • C S Parker BVMS DBR MRCVS

2
Schemes Available
  • Scrapie
  • Maedi Visna
  • Enzootic Abortion
  • Future- Contagious lymphadenitis
  • Far future foot rot?

3
Scrapie
  • What causes it
  • What are the signs
  • How is it transmitted
  • MAFF monitoring
  • Scrapie Genotyping

4
What causes Scrapie
  • ?
  • 3 theories
  • prion
  • genetics

5
Diagnosis
  • Clinical Signs
  • Post mortem

6
DEFRA scrapie monitoring scheme
  • Voluntary certification scheme
  • Holding subject to Veterinary checks
  • animals identified
  • No case scrapie confirmed for 3 years
  • Proportion of cull ewes brain sampled
  • Restocked from similar premises

7
Clinical Signs
  • Itching rubbing and nibbling

8
Clinical Signs
  • Hyperexcitability
  • general trembling
  • odd expression

9
Clinical Signs
  • Inco-ordination

10
How is it transmitted
  • At birth
  • pasture contamination
  • Other vectors?

11
Scrapie genotyping
  • Only one test in animals life
  • tested at any age
  • blood test
  • can be limited to stud rams
  • can be combined at VM testing

12
How does it work
  • 3 codons tested 136 154 171
  • Various combinations

13
What does it cost?
  • Full testing 1-19 36
  • Two codons 30
  • Codon 171 -13
  • Codon 136 - 22

14
Maedi Visna
  • Chronic disease
  • Maedi -chronic pneumonia
  • Visna nervous wasting disease

15
Clinical Signs
  • long incubation
  • progressive pneumonia
  • nervous form

16
transmission
  • milk/colostrum
  • respiration

17
Control Schemes
  • Monitoring scheme
  • Accreditation scheme

18
MV monitoring scheme
  • commercial flocks
  • Not strict isolation rules
  • Not MV accredited
  • Same test protocol as accreditation scheme
  • Only 1 entry test required

19
MV accreditation
  • Strict isolation- 2 metres for grazing, 7 days
    time lapse
  • May share buildings lt10 days - 2m barrier
  • 2 initial tests then bi-annual

20
Future schemes
  • EAE
  • Foot Rot
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