Frequency of cattle farms with ivermectin resistant gastrointestinal nematodes in Veracruz, Mexico

•The objective of this study was to determine the percentage of cattle farms with GINs resistant to ivermectin.•Only two cattle farms had GIN populations susceptible to IVM.•The percentage of cattle farms with IVM resistant GIN was 71.4%.•Management options are proposed for cattle farmers to reduce...

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Bibliographic Details
Published in:Veterinary parasitology 2015-09, Vol.212 (3-4), p.439-443
Main Authors: Alonso-Díaz, M.A., Arnaud-Ochoa, R.A., Becerra-Nava, R., Torres-Acosta, J.F.J., Rodriguez-Vivas, R.I., Quiroz-Romero, R.H.
Format: Article
Language:English
Subjects:
Animals
Anthelmintics - pharmacology
Cattle
Cattle Diseases - epidemiology
Cattle Diseases - parasitology
Data Collection
Drug Resistance
Gastrointestinal Diseases - epidemiology
Gastrointestinal Diseases - parasitology
Gastrointestinal Diseases - veterinary
Gastrointestinal nematodes
Ivermectin
Ivermectin - pharmacology
Mexico - epidemiology
Nematoda - drug effects
Nematode Infections - epidemiology
Nematode Infections - parasitology
Nematode Infections - veterinary
Resistance
Surveys and Questionnaires
Veracruz Mexico
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Summary:•The objective of this study was to determine the percentage of cattle farms with GINs resistant to ivermectin.•Only two cattle farms had GIN populations susceptible to IVM.•The percentage of cattle farms with IVM resistant GIN was 71.4%.•Management options are proposed for cattle farmers to reduce the spread of IVM resistant worms. This study reports the percentage of cattle farms with ivermectin (IVM) resistant gastrointestinal nematodes (GINs) in Veracruz, Mexico, and identifies the GIN genera involved in the resistances. It also describes management practices of anthelmintic (AH) use on the surveyed farms. Twenty-one farms were assessed by means of the faecal egg count reduction test using the McMaster technique. Only two farms had GIN populations susceptible to IVM (9.5%). The proportion of farms with IVM resistant GIN was 71.4% (15/21). Seven of these farms had less than 80% egg count reductions. Haemonchus and Cooperia were the genera most commonly found in the resistant populations, followed by Oesophagostomum. Inappropriate AH treatment practices were identified from the completed questionnaires. Further management practices such as selective treatment and quarantine treatments are proposed to further reduce the spread of IVM resistance between farms.
ISSN:0304-4017
1873-2550
DOI:10.1016/j.vetpar.2015.07.023