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Multiple Tools for IP Control

Multiple Tools for IP Control

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Multiple Tools for IP Control

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  1. Multiple Tools for IP Control Dan Morrical Iowa State University 515-294-0847 morrical@iastate.edu

  2. Old way Drugs, drugs, drugs Newer, stronger, bigger doses No longer sustainable No new drugs

  3. Tools available Knowledge Genetics Selective treatment Parasite resistance Rotational grazing Parasite resistance Land resource

  4. Knowledge High risk animals High risk times Dry lot versus pasture Stock density

  5. Knowledge Larvae levels

  6. Typical parasitic lifestyle Eggs: Development from egg to infective (L3) larvae can occur as early as 6 days Molt into L1’s in the egg then hatch Nematodirus develop into L3’s in the egg, then hatch Most ova do not survive very cold ambient temperatures

  7. Typical parasitic lifestyle L3’s - infective stage Thick cuticle protects them from drying Cannot feed - finite life span Warm temperatures increase their metabolic rate. Can survive some freezing

  8. Haemonchus Adults live in abomasum ingest 0.05ml blood/worm/day 5000 worms will remove 250 ml of blood. Adults are very prolific egg layers Haemonchus L3’s are not as cold hardy as others Most L3’s live for 1-3 months

  9. Genetics Katahdin and NSIP Dorpers ?, Boer goats ? Genetic resistance vs production

  10. Selective treatment FAMACHA treat pale eyes Labor Faith

  11. Resistance Our parasites truly resistant Fecal egg reduction test Drenchrite Refusia

  12. Grazing management Better forage production Better health status Enough nutrients to feed sheep and parasites.

  13. Land Resource Pasture A Pasture B Hayed in 07 grazed in 07 Grazed in 08 hayed in 08

  14. Land Resource, option b Pasture A Pasture B Cattle in 07 Sheep in 07 Sheep in 08 Cattle in 08

  15. Land Resource, option b Pasture A Pasture B Pasture C Cattle in 07 Sheep in 07 Hayed 07 Hayed in 08 Cattle in 08 Sheep 08 Sheep in 09 Hayed in 09 Cattle 09

  16. Safe pastures No sheep or goats from either July 1 to December 31 or January 1 to June 30

  17. Alternative approaches • Cat thyme • Sericea Lespedeza • Copper wire bolus • Fungus • DE

  18. Ewes: 0, .5, 1 and 2 g Lambs: 0, .5, .75, 1.0 g Research Design

  19. Results FEC Ewes: Day 7 FEC increased in ewes to >2000 epg for 0 and .5 gram dose FEC decreased in ewes to <1000epg for 2 g dose Note: 2 g ewes went up to >1500epg on day 35

  20. Results PCV Ewes: from day 0 to day 21 all groups went down slightly 4 ewes had to be treated with PCV below 18 None were in the 2 gram group

  21. Results AST Lambs: no indication of copper problems Ewes: no indication of copper problems Base diet is pasture and TM salt

  22. Applications Extreme care 2 gram dose is like feeding 25 PPM copper for 50 days Documented resistance Use serum AST with 2 g COWP in 5 ewes or less as first step

  23. Summary • Drugs (anthelminics) are not the solution • Develop whole farm strategy • Be creative • Work with your Veterinarian

  24. Questions