History: Age : 35 weeks, flock size : 3500, Breed: Cobb 500 (parent ), Mortality : 16-20/day, Production 35 %
Clinical sign: Depressed, Ruffled feather, Decrease feed and water intake

PM findings :

Content seen while opening Gizzard  Erosion in Gizzard and Hemorrhages in Proventiculus  Swollen Liver 

Intestinal Hemorrhages  Egg shell with in Egg

Yellowish watery mucoid faeces


Please share your professional experience, for dealing these sorts of cases seen frequently in field practice.

Lets deal technically !!

  • field vet

    Need more supporting data .
    How long has this happened? Are there any respiratory symptoms? How many chicken houses have this problem? How much peak production can be achieved before it drops to 35%? In a house that has problems, Does the disease start from a spot (pen)? Then spread to another place? How is the daily mortality pattern?

    If the chicken death is found scattered in all pens at the beginning of the case, non infectious disease may be suspect-toxin. But if the death of the chicken occurs spread evenly in each pen and there is an increase in mortality every day, NE can be suspect. If the death of the chickens starts to occur in a particular pen, then spreads to other pens and the mortality rate increases, the virus becomes suspect (HPAI) (vvND if followed by respiratory symptoms and egg shape changes).

    • The flock size was of 3500 and separated into 3 different pens, and the all flocks are infected. Egg production was at 60% level, and its in decreasing pattern. Males birds are affected more than the female one. Mortality pattern is as like 6-8-4-12-4-2-19 its in zig-zack pattern. There are no such prominent sings of respiratory stress.

  • Dr. Mehedi Hasan

    It seems to me like Mixed infection caused by Salmonella & clostridium. This case should diagnose by ELISA for more confirmation.
    To check the mortality, Florphenicol 10% & Micronized Sulphadiazine with Chemical liver tonic & Electrolytes are effective.

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