Identification of mechanisms of pesticide resistance in cattle ticks

phys.org | 11/14/2018 | Staff
ajoy26 (Posted by) Level 3
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The cattle tick is controlled by pesticides, invariably leading to the selection of resistant strains. In Brazil, this parasite is currently resistant to a greater or lesser extent to all the commercial pesticides used by cattle farmers. The antiparasitic drug most widely used to control cattle tick populations (as well as human parasites) is ivermectin, a broad-spectrum anthelmintic, acaricide, and insecticide.

Brazil's commercial cattle herd totaled 217.7 million animals in 2017, according to the country's Ministry of Agriculture. In the same year, Brazil was the world's leading exporter of beef, shipping a total of US$6.28 billion.

Numbers - Loss - Parasites - Loss - US

The numbers could be even higher if it were not for the huge annual economic loss caused by parasites. This loss is estimated to have reached at least US$13.9 billion in 2014. In other words, the damage caused by parasites in terms of mortality, weight loss, impaired fertility and reduced yield is more than double the value of the annual exports.

The worst damage is caused by internal parasites, such as gastrointestinal worms, which cause losses amounting to US$7.1 billion (51 percent of the total). Next come external parasites, which live on the skin of cattle or visit them to feed. None does more damage than the southern cattle tick (Rhipicephalus (Boophilus) microplus), which accounts for annual losses amounting to US$3.2 billion (23.2 percent). The horn fly (Haematobia irritans) causes losses of US$2.5 billion (18.3 percent), while the damage done by the botfly (Dermatobia hominis), ****-worm fly (Cochliomyia hominivorax) and stable fly (Stomoxys calcitrans) amounts to US$1 billion (7.5 percent).

Article - Scientific - Reports - Study - Researchers

An article published recently in Scientific Reports describes a study in which Brazilian researchers affiliated with the Department of Genetics and Evolutionary Biology at the University of São Paulo's Bioscience Institute (IB-USP) and the Desidério Finamor Institute of Veterinary Research (IPVDF) in Eldorado do Sul (Rio Grande do...
(Excerpt) Read more at: phys.org
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