Avian Encephalomyelitis Egg Drop in ...

Avian Encephalomyelitis Egg Drop in Laying Hens

Avian Encephalomyelitis Egg Drop in Laying Hens

Observed Clinical Signs Happenings

Egg Drop

  • Egg production declines rapidly
  • Mature birds may experience a temporary drop in egg production (5-10%)  and lasting no more than 2 weeks (5-14 days), with a return to full potential  production at the end of this time, but do not develop neurologic signs

Avian Encephalomyelitis Egg Drop in Laying Hens show, exhibit, or manifest any of the following clinical signs happenings:

Observed Clinical Signs Happenings

ALWAYS

NEVER

SOMETIMES

Egg drop

  •  

 

 

Egg production declines rapidly

  •  

 

 

Egg production drops gradually

 

  •  

 

Mortality above the standard

 

  •  

 

Visibly sick birds

 

  •  

 

Flock behaviour activity change

 

  •  

 

Droppings abnormalities

 

  •  

 

Respiratory abnormalities

 

  •  

 

Neurological Nervous

 

  •  

 

Lameness or unusual movements, incoordination, reluctance to move

 

  •  

 

Eyes abnormalities

 

  •  

 

Head: Comb Wattles Face Nostrils Sinuses Mount Beak Earlobes (except eyes)

 

  •  

 

Body Parts (Neck, wings, breast, abdomen, shanks, legs, hocks, feet, joints, vent, and skin, abnormalities), skinny body, retarded growth, weight depression

 

  •  

 

Feathers abnormalities

 

  •  

 

Feed Consumption Changes

 

  •  

 

Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, another feed brand)

 

  •  

 

Shell quality

 

  •  

 

Internal Egg quality

 

  •  

 

 

 

 

Causing Agents
Viral disease. Virus (Picornaviriade family). It has been tentatively placed in the genus Hepatovirus. (Year 2000).
Affected Systems/Organs
Reproductive System
Spread
Via the oral infection route. Contaminated feaces, environment, feed, water and equipment
Mainly Affects
Egg production
Solution
Vaccination Programs, Good Hygiene and Biosecurity practices.
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • Can be managed with vaccination programs
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory
  • Veterinary intervention is recommended

Impact on Egg quality

0

Impact on Liveability

0


Impact on Production

2

Overall Economic Impact

2



  1. David E. Swayne. 2013.  Diseases of Poultry 13th Edition. page 258
  2. Y.M. Saif.2008.Disease of Poultry. 12th Edition. page 488
  3. Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition. page 352
  4. Paul McMullin. 2004. A pocket Guide to Poultry Health and Disease. First Edition. page 76

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