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Anthelmintics and control.

R K Prichard1

  • 1Institute of Parasitology, McGill University, Quebec, Canada.

Veterinary Parasitology
|February 1, 1988
PubMed
Summary
This summary is machine-generated.

Effective control of cattle parasitic Ostertagia ostertagi requires strategic anthelmintic use. Newer drugs like ivermectin and fenbendazole target all larval stages, while older drugs manage adult worms and prevent reinfection.

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Area of Science:

  • Veterinary Parasitology
  • Pharmacology
  • Animal Health

Background:

  • Ostertagia ostertagi, a significant cattle parasite, presents challenges due to its arrested larval stage (hypobiotic EL4) resisting older anthelmintics.
  • Type I ostertagiasis is caused by adult and developing stages, while Type II ostertagiasis results from hypobiotic EL4 larvae.

Purpose of the Study:

  • To review the efficacy of various anthelmintics against different stages of Ostertagia ostertagi in cattle.
  • To discuss strategies for controlling Type I and Type II ostertagiasis and subclinical infections.

Main Methods:

  • Review of existing literature on anthelmintic efficacy against Ostertagia ostertagi.
  • Classification of anthelmintics based on their activity against adult, developing, and arrested larval stages.

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  • Discussion of prophylactic and therapeutic applications of anthelmintics, including slow-release formulations.

    • Main Results:

    • Ivermectin and fenbendazole are effective against all stages, including hypobiotic EL4 larvae, in North America.
    • Older anthelmintics (levamisole, morantel tartrate, etc.) are effective against adult and developing stages for Type I ostertagiasis.
    • Continuous administration or slow-release boluses of older anthelmintics can prevent larval establishment and subsequent Type II ostertagiasis.

    Conclusions:

    • Strategic use of ivermectin and newer benzimidazoles in slow-release devices offers effective control for Type I, Type II, and subclinical ostertagiasis.
    • Anthelmintic application should incorporate epidemiological data to maximize economic benefits and prevent rapid reinfection.
    • Integrated parasite management strategies are crucial for sustainable Ostertagia ostertagi control in cattle.