Should we control BVD in New Zealand

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Slide 1 : 5/8/2009 1 ? Cord Heuer EpiCentre, Massey University Should we control Bovine Viral Diarrhoea in New Zealand
Slide 2 : 5/8/2009 Background BVDV = worldwide pathogen (type I + II) Economic loss NZ: US$ 8-12 per calving ? US$ 31 m/yr USA: US$ 10-57 per calving (US) EU: Know-how + technical tools for eradication available Biosecurity, removal of PI, herd monitoring Cost-benefit of control ~ industry wide participation Is control feasible in NZ?
Slide 3 : 5/8/2009 What’s the worry ? - BVDV in New Zealand Heuer et al. 2004 and 2005, unpublished
Slide :
Slide 5 : 5/8/2009 M&M Questions: What can we learn from the experience of other countries? What are specific features of cattle production in New Zealand relevant for BVDV control? What are the pros and cons for the control of BVDV? By which strategies and methods can BVD be controlled?
Slide 6 : 5/8/2009 What can we learn from the experience of other countries? Focus on preventing farm-level economic loss improving animal welfare and increase access to animal trade BVD notifiable in 8 EU countries OIE: BVD priority disease for animal trade Public funding (e.g. for base-line surveys) justifiable by animal welfare
Slide 7 : 5/8/2009 What are specific features of cattle production in New Zealand relevant for BVDV control? Key differences in NZ cattle farming All year pasture feeding Distinct seasonal calving >90 herds Larger herds than EU/North America Extensive use of breeding bulls Enormous seasonal stock movements (June) Intimate contact between dairy and beef systems Herd performance testing decreasing 36% dairy herds is operated by sharemilkers Contact rate probably lower in pasture based systems
Slide 8 : 5/8/2009 What are specific features of cattle production in New Zealand relevant for BVDV control? Key differences in NZ cattle farming All year pasture feeding Distinct seasonal calving >90 herds Larger herds than EU/North America Extensive use of breeding bulls Enormous seasonal stock movements (June) Intimate contact between dairy and beef systems Herd performance testing decreasing 36% dairy herds is operated by sharemilkers Contact rate probably lower in pasture based systems
Slide 9 : 5/8/2009 What are specific features of cattle production in New Zealand relevant for BVDV control? Key differences in NZ cattle farming All year pasture feeding Distinct seasonal calving >90 herds Larger herds than EU/North America Extensive use of breeding bulls Enormous seasonal stock movements (June) Intimate contact between dairy and beef systems Herd performance testing decreasing 36% dairy herds is operated by sharemilkers Contact rate probably lower in pasture based systems
Slide 10 : 5/8/2009 Example: contagiousness 203 replacement calves 23 PI undetected (12%), 9 died/culled After 2-years contract rearing 22% remained sero-negative
Slide 11 : 5/8/2009 Pros and Cons for BVDV control PROs: High prev + econ.loss ? awareness+incentive ? ? Animal welfare + trade ? Short risk periods Herd size ? = compliance ? Excellent tools available ! Disease control established Success elsewhere CONs: Effect of massive seasonal movements? Risk of re-introduction ?? Feral cattle = biosecurity risk ? Performance testing/AI ? Cost early/benefits visible late Full industry commitment for both beef+dairy ??
Slide 12 : 5/8/2009 Pros and Cons for BVDV control PROs: High prev + econ.loss ? awareness+incentive ? ? Animal welfare + trade ? Short risk periods Herd size ? = compliance ? Excellent tools available ! Disease control established Success elsewhere CONs: Massive seasonal movements Risk of re-introduction ?? Feral cattle = biosecurity risk ? Performance testing/AI ? Cost early/benefits visible late Full industry commitment for both beef+dairy ??
Slide 13 : 5/8/2009 Strategies and Methods for BVD Control Regulation: “Industry not MAF” Rules of supply and trade Market forces: access to animal trade Participation: direct impact on duration If voluntary/unsystematic ? success not realistic Removal of PI + biosecurity Tools for success “no PI = no BVD” Vaccination: protection of ‘free’ herds during control
Slide 14 : 5/8/2009

 


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