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FLUKICIDES IN IRISH DAIRY HERDS. Background. A LONGITUDINAL STUDY OF BULK MILK SEROPOSITIVITY TO FASCIOLA HEPATICA IN A SUBSET OF IRISH DAIRY HERDS.

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Presentation Transcript
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Background

A LONGITUDINAL STUDY OF BULK MILK SEROPOSITIVITY TO FASCIOLA HEPATICA IN A SUBSET OF IRISH DAIRY HERDS

Determination of the prevalence of Ostertagia ostertagi, Fasciola hepatica and Dictyocaulus viviparus in Irish dairy herds using bulk milk analysis and examination of the impact of these parasites on the productivity of those herds.

materials and methods
MATERIALS AND METHODS
  • 22 commercial farms (red dots)
  • 7 Teagasc farms (blue dots)
  • All farms are classified as ‘wet’ or ‘dry’ soil types
results contd
RESULTS (contd.)

High

Monthly average S/P ratios across all study herds

results
RESULTS

Dosing required earlier than dry period

Monthly S/P ratios across ‘Dry’ study farms

Monthly S/P ratios across ‘Wet’ study farms

trial conclusions
TRIAL CONCLUSIONS
  • Liver fluke an issue on a high % of Irish dairy farms
  • Over 80% of farms were positive for fluke by Nov ‘09
  • Usefullness of bulk tank milk testing as a screening technique for F. hepatica
  • No difference in seropositivity between ‘wet’ and ‘dry’ farms.
  • Zero-milk withdrawal flukicide would prove benificial
ban on flukicides
BAN ON FLUKICIDES

Only 2 active ingredients remain on the market

Albendazole (Liver Fluke only)

Oxyclozanide (Liver and Rumen Fluke)

Will require minimum of 2 doses

Third Dose probably required

Current efficacy of these products unknown

ban on flukicides1
Issues on farm may lead to illegal use of banned products

Need to promote the impact that illegal use (accidental or otherwise) could have on international markets

Some farmers currently willing to take the risk

BAN ON FLUKICIDES

WORRYING DEVELOPMENTS

  • Unapproved Albendazole products being promoted e.g. Albencare
  • Misinformation
latest information
LATEST INFORMATION
  • IMB has set a provisional Maximum Residue Limit (MRL) for Closantel
  • Efforts also being made to set provisional MRLs for Triclabendazole and Nitroxynil
  • EU permission required
  • Support for these proposals essential
on going research
ON-GOING RESEARCH

2 PhD projects

Epidemiological studies

Links between fluke and additional diseases

Milk Products

Three active ingredients under study

Triclbendazole

Rafoxanide

Closantel