Bluecomb, Avian Monocytosis, Pullet ...

Bluecomb, Avian Monocytosis, Pullet Disease in Laying Hens

Bluecomb, Avian Monocytosis, Pullet Disease in Laying Hens

It was commonly reported prior to 1960 but it is rare now.

There is some opinion that the disease has disappeared completely

A sudden onset condition of chickens early in lay with high morbidity and mortality. It is associated with hot weather, water deprivation, toxin and possibly a virus infection. It was commonly reported prior to 1960 but it is rare now. Clinical signs include watery diarrhea, wet litter/manure, dark comb and wattles, dehydration and drop in egg production and mortality may be high.

Observed Clinical Signs Happenings

Visibly sick birds

  • Many visibly sick birds
  • Affected birds show depression
  • Soiled vent feathers or pasty droppings
  • The head and its appendages (combs and wattles) are abnormally congested and may appear cyanotic (from which the name blue comb obviously is derived)
  • Shrivelling of the shanks are observed (signs of dehydration)

Egg drop

  • Egg production drop rapidly
  • Severe drop in egg production

Mortality

  • Mortality may be sporadic and usually about 5%  but may be as high as 50%
  • In the more subacute form, signs are less pronounced and deaths are more sporadic

Dead Birds

  • Birds are usually in good bodily condition 

Head Comb Wattles Face Nostrils Sinuses Mount Beak Earlobes

  • The head and its appendages (combs and wattles) are abnormally congested and may appear cyanotic (from which the name blue comb obviously is derived)

Eyes

  • Swelling of the eyes

Droppings

  • Whitish diarrhea
  • Pasty droppings

Feathers

  • Feathers around the vent are conspicuously  soiled with excreta
  • Soiled vent feathers or pasty droppings
  • Dirty or Pasty vents or feathers with droppings around the vent
  • Feces smeared on feathers around the vent
  • Occasionally the disease precipitates a moult

Feed Consumption

  • Feed intake reduced

Bluecomb, Avian Monocytosis, Pullet Disease in Laying Hens DOES NOT exhibit or manifest any of the following clinical signs happenings:

  1. Egg production drops gradually
  2. High mortality or increases rapidly
  3. Dead birds in a poor bodily  condition (“Skinny body”)
  4. Few visibly sick birds
  5. Flock behaviour activity change
  6. Respiratory abnormalities
  7. Neurological Nervous
  8. Lameness or unusual movements, incoordination, ataxia
  9. Body Parts (Neck, wings, breast, abdomen, shanks, legs, hocks, feet, joints, vent, and skin, abnormalities), skinny body, retarded growth, weight depression
  10. Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, Another feed brand)
  11. Shell quality defects
  12. Internal Egg defects

 

 

Causing Agents
It is associated with hot weather, water deprivation, toxin and possibly a virus infection. It was commonly reported prior to 1960 but it is rare now. There is some opinion that the disease has disappeared completely. Pathologists has been puzzled over the sudden disappearance of the disease, and have speculated that it was due to variant strains of infectious bronchitis viruses prior to development of modern vaccines
Affected Systems/Organs
Reproductive, Digestive and Urinary System.
Spread
Unknown
Mainly Affects
Liveability and Egg Production. Digestive Tract Wet Litter/Manure. Watery Diarrhoea.
Solution
Good management. Hygiene. Adequate water supply. Drug therapy. Molasses, multivitamins in water.
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • Can be managed with feed additives, off-the-shelf medications
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory
  • Veterinary intervention is recommended

Impact on Egg quality

0

Impact on Liveability

2


Impact on Production

2

Overall Economic Impact

2



https://babel.hathitrust.org/cgi/pt?id=coo.31924001035298;view=1up;seq=11

Paul McMullin 2004. A pocket Guide to Poultry Health and Diseases. 172

C.Riddell 1991. B.W. Calnek Ninth Ed. Diseases of Poultry. page 850-851

Peterson E.H. 1978 .Servicemasn's Poultry Health Handbook. page 149

 

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