Executive Summary & Operational Context
Black Quarter (BQ, locally known as Langda Bukhar or Sujawa) is an acute, peracute infectious disease of young cattle (6 months to 2 years) caused by the spore-forming soil anaerobe Clostridium chauvoei, characterized by painful crepitating (crackling) muscular gas swellings and over 90% mortality if untreated within 12 hours.
Annual pre-monsoon vaccination of young stock (6 months to 2 years) with Polyvalent Clostridial Vaccine completely prevents sudden pasture deaths.
Pathology & The Diagnostic "Crepitation" Sign
Clostridium chauvoei spores survive in soil for decades. Cattle ingest spores during pasture grazing. The dormant spores circulate in the bloodstream and lodge in heavy muscle groups (thigh, shoulder, rump). When mild bruising or trauma creates localized low-oxygen (anaerobic) tissue conditions, spores germinate explosively, producing necrotizing and hemolytic toxins. Symptoms: High fever (105–107°F), severe acute lameness, followed by a hot, painful swelling on the upper leg or shoulder. As the swelling expands, it turns cold, painless, and crackles like dry paper or bubble wrap when pressed by hand ("Crepitation" due to gas formation). Post-mortem reveals black, dry, porous muscle smelling like rancid rancid butter.
How to Implement on Your Dairy Farm
Vaccinate in May-June Annually
Administer BQ vaccine (or combined HS+BQ vaccine) subcutaneously in May-June before pre-monsoon showers churn the soil.
Emergency High-Dose Penicillin Therapy
If detected early (fever stage before gangrene), immediately inject Procaine Penicillin (20,000–40,000 IU/kg) intramuscularly and around the swelling margins every 12 hours.
Never Open BQ Carcasses in the Open Field
Do NOT perform open post-mortem. Sporulating bacteria will permanently contaminate farm pasture soil. Bury carcass deep (6 ft) covered with quicklime.
Recommended Breeds for this System
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FAQ
Frequently Asked Questions: Black Quarter (BQ / Langda Bukhar): Symptoms, Clostridium Vaccination & Urgent Therapy
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