Ticks identification and resistance of Riphicephalus microplus to amitraz, and ivermectin on livestock in Ecuadorian subtropical farms.

Pérez Otáñez, Ximena;et.al.
(2023) 29th International Conference of the World Association for the Advancement of Veterinary Parasitology — Location: Chennai, India (20.August.2023)

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  • Pérez Otáñez, Ximenaorcid-logoUCLouvain
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Abstract
Cattle ticks, mainly Rhipicephalus microplus, are a major concern for cattle in subtropical regions worldwide. These ticks affect meat and milk production, causing economic losses to livestock farmers. Ticks are also vectors of pathogens. Ecuador is a country with diverse climatic conditions favorable for ticks. Chemical control is the main method of tick control. However, the misuse of acaricides has led to multi-resistance development in ticks. The efficacy of acaricides is now very low in Ecuador. This study aims to determine tick species, diagnose and compare resistance to amitraz(Am), and ivermectin(Iv), in Noroccidente de Pichincha(NP) cattle farms, in two consecutive years using the Package bioassay larval test (PLT) to determine resistance. Sixty-seven farms were sampled in NP in the first year. The results reflect that in NP 98.51%(66/67) of farms had ticks on cattle, which were identified in NP four species: Rhipicephalus microplus, Amblyomma mixtum, Ixodes boliviensis, and Ixodes montoyanus. The specie with the highest presence was Rhipicephalus microplus, with 97.01%(65/67) of farms in NP. For resistance the participant farms were the ones with enough ticks for PLT. Results showed Am, and Iv resistance of 67.21%(41/61), and 57.38%(35/61) for the first year and 59.57%(28/47), and 57.45%(27/47) for the second year respectively. Resistance is an increasing problem for Ecuadorian subtropical livestock, and it is necessary to establish an integrated management program against ticks.
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Pérez Otáñez, X., & et al. (2023). Ticks identification and resistance of Riphicephalus microplus to amitraz, and ivermectin on livestock in Ecuadorian subtropical farms. 29th International Conference of the World Association for the Advancement of Veterinary Parasitology, Chennai, India. https://hdl.handle.net/2078.5/260673