Horse running through summer pasture in tall grass.
RESEARCH PROJECT

Selective treatment for the control of strongyles - risks and opportunities

Updated: July 2025

Project overview

The official name official name of the project:
Selective deworming against bloodworms – risks and opportunities
Project manager: Eva Tyden
Contact: Eva Tyden
Funded by: The Horse Research Foundation, Project number H-15-47-097

Participants

Project members:

More related research

Short summary

Parasites can develop resistance to anthelmintic drugs, which is a threat to the health of horses.

Like antibiotics, it is necessary to be restrictive with anthelmintics in order to preserve the effect. Therefore, selective deworming of horses has been recommended for the last ten years. However, despite the new guidelines, there are indications that parasite-related damages have increased in recent years.

Aim

The aim of this projects is to investigate the presence of large blood worms in Swedish and Norwegian horse farms and to investigate whether selective deworming can be linked to an increase in parasite occurrence and parasite-related damage. The effect of grazing hygiene measures in addition to worming will also be evaluated.

Collaborations

The project is a collaboration between SLU, SVA and the Norwegian University of Life Sciences (NMBU). In addition to Eva Tydén, a researcher at SLU, the research group also includes:

  • Eva Osterman-Lind, veterinarian, SVA
    Heidi Enemark, NMBU

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