Newcastle disease in Poultry, laying hens, 28 weeks, with late peak production performance, very low mortality.
Velogenic Newcastle disease (vvND) virus is a very deadly virus in poultry. This virus is still able to cause clinical symptoms in chickens that have been vaccinated with immunity at the medium level. In adult commercial layer chickens, ND virus rarely leads to high mortality, even without the death of chickens at all. Because in commercial chicken vaccination has been done repeatedly during the rearing.
The mortality rate does not rise significantly, if any, only in certain individual chickens that have only very low antibody titres. But that’s rare.
If the virus infects at the time of laying, mild respiratory symptoms may still be observed, decreased egg production or egg production disorders become the most dominant symptom.
Many diseases in chickens can cause similar symptoms. Avian influenza (H9N2 virus infection), infectious bronchitis causes symptoms similar to those of newcastle disease in adult chickens or on egg production performance. Thin eggshell, abnormal eggshell, watery albumin and respiratory symptoms.
See also: Our Channel Video, poultry diseases video, Field Vet Channel on youtube
Pale eggshell color, very similar to avian influenza H9N2 infection in chickens.
see also: Pictures of Viral Diseases in Chicken
The color of the eggshell is the most easily observed change in case of a problem with brown layer chicken.
Watery albumin, abnormal eggshell, small eggs, with a blood spot, meat spot in albumin, in this case, is very confusing with cases of infectious bronchitis. Many misdiagnoses occur in the field for newcastle disease cases with no significant mortality with infectious bronchitis.
see also: Pictures of Infectious Bronchitis
Rarely do we get significant anatomical Pathology lesions in Newcastle disease cases in chickens with medium or higher immunity. However, from thousands of chickens in a troubled flock, sometimes there are still chickens that show nerve symptoms in only a few chickens, these chickens can be indicator infections of Newcastle disease or differentiator with infectious bronchitis.
At least we do a serological test to confirm a diagnosis. We will get a very significant antibody titer difference at the beginning of the case and after a few weeks, the case occurs. High antibody titers are needed for stronger protection against clinical symptoms of velogenic viscerotropic Newcastle disease. Kill vaccine is in need. Please share, for veterinary discussion, Thank you.