Colibacillosis, Layer Colisepticemi ...

Colibacillosis, Layer Colisepticemia, in Laying Hens

Acute colibacillosis in layers is being seen with increasing frequency. The majority of outbreaks are associated with the onset of egg production, but they occur less frequently at an older age or may continue as the flock ages and potentially spread to older flocks or subsequent flock placed on farms or in houses where affected flocks had been previously.

Although technically, death is not a clinical sign, this may be the main indication of an outbreak of colibacillosis in a flock.  Death usually occurred suddenly without premonitory signs although depression and/or dirty vents may be observed in some affected hens in approximately half of the flock.

Weekly mortality is significantly higher in unaffected flocks than in egg-matched control flocks. Cumulative mortality ranges up to 10% and mortality remains elevated for 3 to 10 weeks.

Polyserositis (perihepatitis, pericarditis) and peritonitis are associated with free yolks in the peritoneal cavity and are present in most birds at necropsy. Oophoritis and salpingitis occur less frequently.

Observed Clinical Signs Happenings

Mortality

  • Low mortality or increases gradually
  • Although technically, death is not a clinical sign, this may be the main indication of an outbreak of colibacillosis in a flock
  • Weekly mortality is significantly higher
  • Cumulative mortality range remained elevated for 3—10 weeks  

Dead birds

  • Poor bodily  condition (“Skinny body”)
  • Dead usually occurred suddenly without premonitory signs, although depression and/or dirty vents were observed 

Visibly sick birds

  • Few visibly sick birds
  • Depression
  • Dirty vents
  • Dead usually occurred suddenly without premonitory signs, although depression and/or dirty vents were observed 

Droppings abnormalities

  • Dirty vents were observed in some affected hens in approximately half of the flocks
  • Dirty feathers with droppings around the vent or Pasty vents

Feathers abnormalities

  • Dirty feathers with droppings around the vent or Pasty vents

Colibacillosis, Layer Colisepticemia, in Laying Hens DOES NOT exhibit or manifest any of the following clinical signs happenings

 

  • Egg drop
  • High mortality or increases rapidly
  • Dead birds: Good bodily condition (“full crop”)
  • Many visibly sick birds
  • Flock behaviour activity change
  • Respiratory abnormalities
  • Neurological Nervous
  • Lameness or unusual movements, incoordination, ataxia
  • Eyes abnormalities
  • Head, Comb, Wattles, Face, Nostrils, Sinuses, Mount, Beak, Earlobes, abnormalities (except eyes)
  • Body Parts (Neck, wings, breast, abdomen, shanks, legs, hocks, feet, joints, vent, and skin, abnormalities), skinny body, retarded growth, weight depression
  • Feed Consumption Changes
  • Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, another feed brand)
  • Shell quality defects
  • Internal Egg defects
Causing Agents
Bacterial infection. Escherichia coli
Affected Systems/Organs
Respiratory, Digestive, Reproductive Systems
Spread
Infection is by oral or inhalation routes, water, contaminated objects and dust. Commonly seen following upper respiratory diseases
Mainly Affects
Liveability. Performance
Solution
Drug treatment (veterinary supervision required). Control of respiratory diseases, inmmunosuppression and predisposing factors.
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • Technical assistance recommended
  • Can be managed with feed additives, off-the-shelf medications
  • 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

2


Impact on Production

0

Overall Economic Impact

3



Y.M. Saif.2008.Disease of Poultry. 12th Edition. page 708

David E. Swayne. 2013. Diseases of Poultry 13th Edition. page 776

 

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