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Multiple Tools for IP Control. Dan Morrical Iowa State University 515-294-0847 [email protected] Old way. Drugs, drugs, drugs Newer, stronger, bigger doses No longer sustainable No new drugs. Tools available. Knowledge Genetics Selective treatment Parasite resistance

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Multiple tools for ip control
Multiple Tools for IP Control

Dan Morrical

Iowa State University

515-294-0847

[email protected]


Old way
Old way

Drugs, drugs, drugs

Newer, stronger, bigger doses

No longer sustainable

No new drugs


Tools available
Tools available

Knowledge

Genetics

Selective treatment

Parasite resistance

Rotational grazing

Parasite resistance

Land resource


Knowledge
Knowledge

High risk animals

High risk times

Dry lot versus pasture

Stock density


Knowledge1
Knowledge

Larvae levels


Typical parasitic lifestyle
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


Typical parasitic lifestyle1
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


Haemonchus
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


Genetics
Genetics

Katahdin and NSIP

Dorpers ?, Boer goats ?

Genetic resistance vs production


Selective treatment
Selective treatment

FAMACHA

treat pale eyes

Labor

Faith


Resistance
Resistance

Our parasites truly resistant

Fecal egg reduction test

Drenchrite

Refusia


Grazing management
Grazing management

Better forage production

Better health status

Enough nutrients to feed sheep and parasites.


Land resource
Land Resource

Pasture A Pasture B

Hayed in 07 grazed in 07

Grazed in 08 hayed in 08


Land resource option b
Land Resource, option b

Pasture A Pasture B

Cattle in 07 Sheep in 07

Sheep in 08 Cattle in 08


Land resource option b1
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


Safe pastures
Safe pastures

No sheep or goats from either

July 1 to December 31

or

January 1 to June 30


Alternative approaches
Alternative approaches

  • Cat thyme

  • Sericea Lespedeza

  • Copper wire bolus

  • Fungus

  • DE


Research design

Ewes:

0, .5, 1 and 2 g

Lambs:

0, .5, .75, 1.0 g

Research Design


Results fec
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


Results pcv
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


Results ast
Results AST

Lambs: no indication of copper problems

Ewes: no indication of copper problems

Base diet is pasture and TM salt


Applications
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


Summary
Summary

  • Drugs (anthelminics) are not the solution

  • Develop whole farm strategy

  • Be creative

  • Work with your Veterinarian



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