Learn Animal Disease with Braimy -B.Sc. Agriculture
About Lesson
  • Also known as black leg
  • Acute infectious, toxemic disease of cattle and sheep
  • 6 months-2 years of animal are affected any time of season.

A calf affected with black quarter showing lesions (black arrow) due to...  | Download Scientific Diagram

a) Etiology:

  • Clostridium chauvoei

b) Transmission:

  • Ingestion of spores contaminated food and water.
  • Wound infection.

c) Pathogenesis:

  • Bacteria spore enter through wound à Germinate in intestine and enter into blood circulation à reach to blood vascular system à bacteremia -à under favorable condition, proliferate and release endotoxin à produce systemic toxemia and lead to death

d) Symptoms:

  • High fever ( 1060F)
  • Swelling in thigh and shoulder muscles
  • Initially, swelling is hot and painful to touch and soon becomes cold and painless.
  • Produce crepitating sound in pressure
  • Mortality 100%, morbidity 20%
  • Animal die within 12-48 hrs
  • Discharge of blood from orifices, rapid clotting of blood
  • Muscles is blackened.
  • Skin affected become stiff, black or dark red in color.


e) Diagnosis:

  • On the basis of history:- vaccination, wound infection, etc.
  • Lameness, hot swelling in thigh muscles producing crepitating sound on pressure.

f) Differential diagnosis:

  • Anthrax, Black disease, Lead and other chemical poisoning, venomous snake bite

g) Treatment:

  • Antibiotics like penicillin, aureomycin and oxytetracycline can be used.
  • Isolation of animal and keep away from infected area
  • Burn or bury dead body.
  • Vaccination
  • Don’t allow to remove skin from infected animal
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