Growing Period
RESPIRATORY

CASE HISTORY, FLOCK #1

      This flock is from a farm with a single "high rise" Pennsylvania house containing 80,000 layer birds, 32 weeks of age.  Egg production in the flock suddenly and significantly decreased.  The birds also decreased their feed intake from 22 lbs. of feed per 100 birds per day to 21 lbs.  On close observation, the serviceperson noted in a small number of birds, with very mild respiratory disease characterized by "snicks" and rales.  The manure pit was dry and ammonia levels were normal.


CLINICAL SIGNS, FLOCK #1

      Eight birds were presented for examination.  All were depressed, one was noticed to cough.

Important Information:

 

DIFFERENTIAL
DIAGNOSES (DD)

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

 

POSTMORTEM EXAM, FLOCK #1

All eight birds were in production.  A shell-less egg was 
found in the box transporting the birds to the laboratory.
6/8                           cloudy airsacs
4/8            catarrhal rhinotracheitis

 

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)