BROODING PERIOD (0-2 WEEKS)

CASE HISTORY, FLOCK #3

      Flock #3 is from a five house broiler farm.  Each house contains 30,000, five day old broilers.  In house #1, the mortality was 600 on day 2, 1,000 on day 3, and 2,000 on day 4.  Mortality was normal in all other houses on the farm.  The farmer thinks he got a "bad load" of chicks.  The serviceperson felt the temperature was normal but he smelled "ammonia" in the house.


CLINICAL SIGNS, FLOCK #3

      100 were presented for examination (15 alive, 85 dead).  All were noticeably affected, weak and depressed.  Some chicks had pasty vents and some signs of respiratory disease were noticed.

Important Information:

 

DIFFERENTIAL
DIAGNOSES (DD)

EXPECTED POST MORTEM
FEATURES FOR EACH 
BEST CONFIRMED BY
WHAT FURTHER WORK-UP

 

POSTMORTEM EXAM, FLOCK #3

25/30 


no food in digestive tract

15/30 infected yolk sacs
10/30  dark, dehydrated muscles
10/30 "cheesy" cecal cores
8/30 corneal ulcers
8/30  multifocal white liver lesions
3/30 severe beak trimming

 

Updated differential diagnosis (based on clinical history and postmortem findings) list the most likely first.

 

What further laboratory tests would you run to confirm your diagnosis?

 

Treatment (for each differential listed)

 

Prevention (for each differential listed)