ovine brucellosis - leading sheep
TRANSCRIPT
Ovine brucellosis
Louise Mullemeister
Senior Veterinary Officer
Biosecurity Queensland
Roma
Brucellosis
Species Host Presence
Brucella ovis Sheep Occurs in Australia
Brucella suis* Pigs Occurs in Australia
Brucella abortus* Cattle Exotic
Brucella melitensis* Goats Exotic
Brucella canis* Dogs Exotic
*Potentially zoonotic
Ovine brucellosis
• Reduced semen quality & increased ram
turnover
• Poor conception rates
• Reduced lamb marking percentage
• Extended lambing period
– Pasture management & supplementation
– Metabolic disorders & mismothering
– Wool length & quality
– Lamb weights & condition scores
• Abortions (uncommon)
Economic impact
• Ram to ram
– Indirectly via ewe
• Passive venereal transmission
– Directly
• Sodomy
• Licking prepuce
• Ram to ewe (uncommon)
Transmission
Reproductive anatomy
Reproductive anatomy
Symptoms
Symptoms
Not all rams infected with ovine brucellosis will have palpable abnormalities.
Not all palpable abnormalities are due to ovine brucellosis.
• Complement fixation test (CFT)
• Semen culture
• Post mortem & culture of reproductive organs
Diagnosis
• Not a notifiable disease in Qld
• No regulatory control
• No enforced eradication/control program
• Voluntary Ovine Brucellosis Accreditation
Scheme
– Flock & property biosecurity measures
– Clinical examination & testing regime
Control/eradication
With regards to the Ovine Brucellosis Accreditation
Scheme, who:
• Has an accredited flock
• Only buys rams from an accredited flock
• Isn’t accredited & doesn’t buy from accredited
flocks?
Poll
Eradication
• Culling & replacing entire ram flock
• Identifying, testing & culling infected animals
• Combination of control & eradication programs
Control
• Using additional rams at joining
• Manual palpation of rams prior to joining
• Extending joining period
• Regular turn-over of rams
• Weaning prior to joining
Control/eradication
Program considerations:
• Sheep-proof fencing
• Clean musters
• Individual identification of rams
• Prompt removal of infected rams
• Avoid joining period
• Consistent testing intervals
• Test straying animals
• Buy rams from accredited flocks/tested prior to entry
Seek veterinary advice first
Eradication
Flock & property biosecurity
• Sheep proof fences
• Livestock records
• Isolation from unknown, unaccredited, infected
sheep
• Management of straying sheep
• Source sheep from OB accredited flocks
• Isolate & test introduced sheep
Prevention
Questions?
Slide 1: http://www.nzva.org.nz
Slide 3: http://dpi.nsw.gov.au;
http://australiandorper.com.au;
http://www.dpi.qld.gov.au;
http://www.whitesuffolk.com.au
Slide 6, 7, 8 & 9: http://dpi.nsw.gov.au
Slide 10 & 11: http://fao.org;
http://flockandherd.net.au
Slide 13: http://sheepconnectsa.com.au
Slide 14: http://oie.int
Image references