Patho practical exam - Broilers

Question 1

Major diseases occurring during broiler rearing

Answer 1

1. Enteric diseases (ED)
2. Enteric disease Complex
3. Other enteric diseases
4. Respiratory diseases
5. Some major** non infectious** diseases

Question 2

General pathogenesis of viral enteritides

Replication of the virus

Answer 2

• Villus atrophy
• Villus denudation
• Extraintestinal lesions
  1. abnormalities of feathering
  2. Disorders of** bone formation** (ricketts, osteoporosis, tibial dyschondroplasia (TD), epiphyseolisis)
  3. Vitamin-E deficiency
  4. Atrophy of the immune organs (immunosuppression, secondary infections)

Question 3

Normal intestinal mucosa ratio

Answer 3

Crypt : villus = 1 : 7

Question 4

Enteric diseases and their consequenses

Answer 4

• Villus denudation
• Villus atrophy
• Multifocal inflammatory cell infiltration in the liver (portal circulation!)
• Diarrhea – wet litter – pododermatitis – ventral recumbency (sternal bursitis, dehydration, starvation)
• Dehydration – renal degeneration (enlarged, pale kidneys, or tubular pattern & Degeneration of the epithelium of the renal tubules)
• Heterogeneous flock
• Epiphyseolysis (femur) the epiphysis detaches – exsanguination
• Abnormal feathering

Question 5

Other enteric diseases

Answer 5

• Necrotic enteritis (NE) - Bacterium
• Coccidiosis –> Parasite

Question 6

Enteric disease Complex

Answer 6

• Runting-Stunting Syndrome (RSS)
• Malabsorption syndrome (MAS)
• Infectious stunting syndrome (ISS)
• Pale bird syndrome (refers to pale legs due to impaired carotene absorption)
• Helicopter disease (refers to abnormalities of feathering)
• Brittle bone disease (refers to disorders of bone formation due to impaired calcium absorption)

Question 7

Respiratory diseases

Answer 7

1. Catarrhal rhinitis
2. Fibrinous airsacculitis
3. Serofibrinous serositis
4. Differential diagnosis
   * Avian influenza (AI) (bird flu)
   * Newcastle disease (ND)
   * Infectious bronchitis (IB)
5. Mycoplasmosis
   * Sinusitis
   * Arthritis
   * Serofibrinous bursitis –> Sternal bursa
6. Colibacillosis
   * Chronic Respiratory Diseases (CRD)
   * Fibrinous serositis
7. Ornithobacteriosis - ORT
   * Catarrhal rhinitis
   * Serous airsacculitis

Question 8

Some major non infectious diseases

Answer 8

• Tibial Dyschondroplasia (TD)
• Sternal bursitis (breast blisters)
• Deep pectoral myopathy (Oregon disease, green muscle disease)
• Ascites syndrome (PHS)