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PRRSV control and eradication in Spanish farms

PRRSV control and eradication in Spanish farms. Enric Marco m arco i collell; S.L. “Test and removal” (Dee and Molitor , 1998), Closed up of the herd ( Torremorell and Christianson, 2001) Partial depopulation ( Plomgaard , 2001) . PRRS is possible.

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PRRSV control and eradication in Spanish farms

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  1. PRRSV control and eradication in Spanish farms Enric Marco marcoi collell; S.L.

  2. “Test and removal” (Dee and Molitor, 1998), • Closed up of the herd (Torremorell and Christianson, 2001) • Partial depopulation (Plomgaard, 2001) PRRS is possible

  3. Persistence of the virus (Zimmerman, et al., 1992) • 152 days in tonsils of infected animals (Wills, et al. 1997) • 92 days in semen (Christopher-Henningset al., 1995, Swenson et al. 1994) • Viremic piglets can shed virus up to 7-16 weeks (Benfield et al., 1996) Critical points

  4. Case 1: PRRS eradication in a small farrow to finish herd

  5. Year 2,000 • 230 sows farm • Farrow to finish herd. • Batch farrowing every 15 days. • Finishing capacity: 50% • Sows: LD x LW • Boars: Pietrain-Halothane (-) (I.A.) The farm

  6. Sus Scrofa (Cal Rech, Barcelona) The farm

  7. The farm

  8. Aujeszky’s disease • PRRS • Mange • Mycoplasma hyopneumoniae • Actinobacilluspleuropneumoniae • Finishing mortality up to 25-30% The farm –health status

  9. Eradicate: • PRRS • App • Mange Objective

  10. Switzerland eradicate M. hyo from small herds (Zimmerman, 1996). • Denmark, the same methods are apply in larger herds (Plomgaard, J. 1998) Eradication plan

  11. BASES: • No animals present younger than 10 month of age. • No replacement during 6 months. • Nursery and finishing depopulation. • Stop farrowing or move them to other facilities. • Medicate the remaining stock Eradication plan

  12. Medication all remaining animals: • 5 injections of enrofloxacin (2,5 mg/Kg. BW) on days 1, 4, 8, 11 and 14. • 2 injections of Doramectin (3 mg./Kg. BW) 14 days apart. • Good cleaning and disinfection of empty rooms. Eradication plan

  13. Sows wean outside farm were located in isolation during 15 days • Where received Enrofloxacin and Doramectin. • A.I. during this period. • Remodelling took place during the eradication time. Eradication plan

  14. No clinical signs of mange observe till now. • No mange control is done. • No lesions, no clinical signs of App observed till now. Results

  15. M.hyois still present on the farm. • Replacement come from a positive source. • Farm produced PRRS negative stock until December 2001 when became reinfected. Results

  16. Case 2: PRRS eradication in a small farrow to finish Boar multiplier by total depopulation

  17. Year : 2,002 • 300 sows farm • Farrow to finish herd. • Boar multiplier • Batch farrowing every week. • Finishing capacity: 50% (boars and replacement) • Sows: LW and (LW x Pt) • IA in the farm: 5 boars: Pietrain The farm

  18. The farm

  19. The farm

  20. Mycoplasma hyopneumoniae • PRRS infected in August 2001 The farm –health status

  21. BASES: • Stop positive replacement during 6 months. • Nursery and finishing depopulation. Eradication plan

  22. 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Farm lay out

  23. Last PRRS negative replacement moved in 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Eradication starts. January 2002

  24. Replacement of all AI boars by PRRS (-) Last Replacement PRRS (+) 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns At 3 weeks piglets are weaned outside Eradication: March 2002

  25. Piglets are weaned again inside 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Eradication: September 2002

  26. NEW PRRS negative replacement moved in 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Eradication: October 2002

  27. All samples Show PRRS negative results 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Eradication: December 2002

  28. PRRS (+) 500 m. Gestation Farrowing room Nurseries Finishing barns Poultry barns Eradication: January 2003

  29. January 2004: same process is done again • October 2004: Positive animals in Finishing again • EXTERNAL FINISHING HAS NOT BEEN EMPTIED Eradication continues

  30. January 2005: TOTAL DEPOPULATION • May last PRRS (+) sows farrow • July 2005 first sows farrow • To accelerate the program matings has been done out side. • New stock: • PRRS negative • M. hyo negative Eradication continues

  31. Case 3: PRRS eradication in a 3 sites herd

  32. Year 2,003 • 1.400 sows multiplier farm • 3 sites herd. • Farrowing every week. • Sows: Lw and Ld x Lw • AI boar stud in farm • 6 Boars: LD and (Lw x D) The farm

  33. The farm

  34. Mycoplasma hyopneumoniae • PRRS The farm –health status

  35. SITE 2 > 10 Km. SITE 1 > 1000 Km. Gestation Farrowing room Nurseries Finishing barns: Own replacement Farm lay out EXTERNAL SITE 3

  36. SITE 2 800 m. SITE 1 > 10 Km. 3 Km. Gestation Farrowing room Nurseries Finishing barns: Own replacement and gilts to sale Future farm lay out SITE 3

  37. BASES: • Stop positive replacement during 6 months. • Nursery and finishing depopulation. Using the possibility of new facilities. Eradication plan

  38. March 2003: Last replacement PRRS (-) • June 2003: Last replacement show titers to PRRS • June 2003: Inside nurseries emptied • July 2003: 4 weeks after, weaned pigs moved to new sites 3 (wean to finish) • Own replacement and few more to fill up barns. Eradication Plan

  39. July 2003: inside nurseries emptied • October 2003: Inside Finishing barn emptied • November 2003: New PRRS replacement located in new inside finishing barn. • Managed independently. • November 2003 old inside finishing remodeled to gestation • December 2003: • Elimination of any gilt or sow PRRS (+) not mated. • Stop using PRRS (+) boars Eradication Plan

  40. February 2004: Replacement in new site 3 negative to PRRS is moved to site I. • March 2004: last farrowings from PRRS (+) sows • April 2004: first farrowing from new PRRS (-) gilts. • April 2004: weaners moved to new Site 2. • April 2004: Old site 2 is emptied. Eradication Plan

  41. Up today all analysis have shown negative results form all sites. Results

  42. Form last replacement negative to become positive: 3 m. • From last replacement negative to first weaners (future replacement on external site) that remain on farm: 4 m . • From last replacement once positive to new replacement negative: 5 m. Production gaps

  43. Case 4: PRRS eradication in a 3 sites herd without partial depopulation

  44. Year: 2,006 • 800 commercial farm • 3 sites herd. • Farrowing every second week. • Sows: Ld x Lw • AI boar stud in farm • 4Boars: Pietrain • Own replacement • GP’s external source The farm

  45. Site 1 Site 2 The farm

  46. Gestation Ownreplacement Farrowing The farm: site 1

  47. The farm: site 2

  48. 400 sows close herd • 1992 PRRS infection • 1998 control PRRS • Own-replacement • Gp’s + F1 acclimatization (contact with viremic pigs) • 2002 • Change to 3 sites system • Increase population from 400 sows to 750 • 2006 • PRRS circulating on site 2 + 3 • No circulation on sow herd History

  49. Mycoplasma hyopneumoniae • PRRS The farm –health status

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