Ana Júlia Leite Ferraz da Costa

Universidade Federal de Minas Gerais

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Walter dos Santos Lima

Universidade Federal de Minas Gerais

Maria do Socorro Veloso Leite Ferraz da Costa

Universidade Federal de Minas Gerais

Ricardo N. Araújo

Universidade Federal de Minas Gerais

Rafael Ferreira Simões

Universidade Federal de Minas Gerais

Cooperative Institutions

Universidade Federal de Minas Gerais

Instituto de Ciencias Tecnológicas

Universidade Federal de Lavras

Hospital Alvorada

Universidade Presidente Antônio Carlos

Louisiana State University

Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular

Universidade Federal do Rio de Janeiro

Fraunhofer Portugal Research

National Council for Scientific and Technological Development

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Anthelmintic resistance in a dairy cattle farm in the State of Minas Gerais

Revista Brasileira de Parasitologia Veterinária/Brazilian Journal of Veterinary Parasitology (2011)

Maria do Socorro Veloso Leite Ferraz da Costa Ricardo N. Araújo Ana Júlia Leite Ferraz da Costa Rafael Ferreira Simões Walter dos Santos Lima

Eighty-four half-blood Gir × Holstein (F1) calves aged six months who were naturally infected by gastrointestinal helminths and maintained in rotational grazing received different anthelmintic treatments. Group A received anthelmintics according to the usual management in the property (eight treatments, seven including a macrocyclic lactone agent). Group B received strategic treatment (ivermectin 3.15%) at the beginning and at the end of the rainy period. Eggs per gram of feces (EPG) counts and genus of larvae from fecal cultures were determined on a monthly basis from April 2002 to December 2003. There was no significant reduction (p > 0.05) in EPG counts in any group after anthelminthic treatment, and the larvae in fecal cultures observed were Cooperia, Haemonchus, Oesophagostomum and a few Trichostrongylus. Cooperia was the most prevalent genus in the first four months of the experiment and Haemonchus in the following months. In 2003, tracer calves were introduced onto the pastures monthly and they showed high nematode burden many times throughout the year, and Cooperia punctata and Haemonchus contortus were the main species identified. The results suggest that there is anthelminthic resistance in this farm, mainly to macrocyclic lactones, and the development of immunity by crossbred animals was vital to reduce nematode burden.

10.1590/s1984-29612011000200005

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