CHICKEN NEWCASTLE DISEASE SYMPTOMS
Newcastle Disease Symptoms In Chicken
SYMPTOMS of Newcastle Disease Symptoms In Chicken depend on factors that influence the incubation period. It also accounts for the variation in the clinical signs observed after infection. Clinical symptoms of Newcastle disease chicken and in other poultry species can be different and depend not only on the species but also on the specific breed of bird.
1. Blue Comb
The comb may become blue as the bird becomes cyanotic in Newcastle disease. but hemorrhages are only seen with some isolates.
Both eyelids are swollen preventing them from fully opening. in some cases, eyelids are crusted with a small amount of yellow material.
The ocular conjunctiva is visible along the lateral canthus of the eye and a congested blood vessel is evident. The conjunctiva has been reflected back to show that the mucosa is swollen, dark red and wet.
4. Green Color Feces
A close-range view of the feces shows both the green bile pigment as well as the white urates. These diarrheal feces is somewhat characteristic of Newcastle disease.
A large amount of watery diarrhea is a common finding in Newcastle disease. This diarrhea often has a greenish color due to the presence of bile.
Additionally, diuresis results in an excessive amount of white urates seen in these feces in Newcastle disease.
Mesogenic strains of Newcastle disease usually result in low or no mortality in 4-week-old chickens and will present with neurological signs such as torticollis, and paralysis.
6. Facial edema
Bilateral facial edema of the face is produced a square-shaped face. It is often the best appreciating from this vantage point in viscerotropic velogenic Newcastle disease. In the severe cold season, There is bilateral swelling of the face which gave the head a “square” contour.
In viscerotropic NDV, Edema of the eyelids typically produces an “almond-shaped” appearance to the eyes. Mild edema of the face and neck which is one of the early signs of the neurotropic form.
7. Nasal cavity
Accumulation of mucus in the nasal cavity which is seen after pressing the nose.
Other symptoms are Respiratory symptoms, including mucus in the respiratory tract, which can be associated with both low virulence and high virulence NDV.
8. Egg abnormalities
Well-vaccinated layers infected with Viseratropic Newcastle disease (vNDV) may only present with a decrease in egg production 1 week after infection, with the fewest eggs produced 2 to 3 weeks post-infection, after which the number of eggs produced will start to increase.
The percentage decrease in egg production depends on the strain of NDV. At 1 month after infection, misshapen and corrugated size.
Newcastle disease always associated with Coccidiosis in broiler and layer hen. the medication of anticoccidial drugs runs with other drugs in Newcastle disease.
The common Newcastle disease symptoms in chicken are
Greenish color feces
Coughing with jerking head
vent pasting with green feces
Sharp feed reduction day by day
Rapid mortality which is increased day by day.
Diseases of Poultry, 13th Edition Editor-in-Chief David E. Swayne Laboratory Director Southeast Poultry Research Laboratory Agricultural Research Service U.S. Department of Agriculture Athens, Georgia United States