BROODING PERIOD (0-2 WEEKS)


CASE HISTORY, FLOCK #1
       
Flock #1 is from a single two story broiler house (36,000 birds).  This winter brooded flock had high early mortality starting at 2 days of age.  The serviceperson noticed the chicks were huddling under the brooders and the brooders had run out of gas.  The mortality has been steadily rising from 350 birds at day 2 to 900 and 970 at days 3 and 4 respectively.  The morbidity is 15%.

CLINICAL SIGNS, FLOCK #1
 
     
30 chicks were presented for examination (10 alive, 20 dead).  All were noticeably affected, extremely weak and depressed.  The live birds were recumbent and trembling and all were gasping for breath.

Important Information:

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DIFFERENTIAL
DIAGNOSES (DD)

EXPECTED POST MORTEM
FEATURES FOR EACH 
BEST CONFIRMED BY
WHAT FURTHER WORK-UP
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POSTMORTEM EXAM, FLOCK #1

20/30  small yellow nodules on airsacs and in lungs
3/30  small yellow nodules in brain and liver
2/30  infected yolk sacs

 

Updated differential diagnosis (based on clinical history and postmortem findings) list the most likely first.
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What further laboratory tests would you run to confirm your diagnosis?
Name Test
Name Test

 

Treatment (for each differential listed)
Name Treatment
Name Treatment

 

Prevention (for each differential listed)
Name 1.  ????
2.  ????
3. 
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Name 1.  ????
2.  ????
3.  ????