Impact on beef cattle productivity of infection with anthelmintic-resistant nematodes
- Cantón, Candela
- Ceballos, Laura
- Dominguez, Maria Paula
- Fiel, Cesar Alberto
- Liron, Juan Pedro
- Moreno Torrejon, Laura
- Cantón, Lucila
- Bernat, Gisele Anahí
- Lanusse, Carlos Edmundo
- Alvarez, Luis Ignacio
DOIAbstract
Aims: The main goal of the current study was to evaluate, on a commercial beef cattle farm, the impact of infection with gastrointestinal nematodes resistant to both ivermectin (IVM) and moxidectin (MXD) on the productivity of calves. Methods: Male Aberdeen Angus calves, aged 9–11 months, with faecal nematode egg counts (FEC) ≥200 epg and body weight ≥190 kg, were allocated to two herds. Herd A (n = 90) grazed a maize-winter forage crop rotation and Herd B (n = 90) grazed a 2-year-old Agropyrum pasture. On Day 0 in each herd, calves were randomly allocated into five groups (n = 18), which were treated with 0.2 mg/kg IVM; 0.2 mg/kg MXD; 3.75 mg/kg ricobendazole (RBZ), both IVM and RBZ, or remained untreated. Faecal samples collected on Days ...
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