The effect of anthelmintic resistance on the productivity in feedlot cattle

Authors
Fazzio, Luis Emilio; Sánchez, Ricardo O.; Streitenberger, Nicolás; Galvan, Walter Ruben; Giudici, Claudio J.; Gimeno, Eduardo Juan
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
The aim of this study was to evaluate, in a commercial feedlot, the effect of different anthelmintic drugs on the productivity of naturally infected calves from a cow-calf operation, where resistance to ivermectin (IVM) has been previously detected. The study began with the random selection of 80 calves whose weight was 132 ± 12. kg. Four groups were made: IVM, ricobendazole (RBZ), ricobendazole plus levamisol (RBZ + LEV) and a control group (CG) without treatment. On days 0, 21, 42, 70, 98 and 126, manual collection of fecal matter and individual weight were registered. Mixed SAS procedure was used for statistical analysis. The percentages of fecal egg count reduction test (FECRT) calculated 21days post treatment (PT) were 18%, 96% and 100% for the IVM, RBZ and RBZ + LEV groups, respectively. Body weight (± SEM) at the end of the trial was 266. kg (±0.9), 269. kg (±1.1), 276. kg (±1.3), 280. kg (±1.9) for CG, IVM, RBZ and RBZ + LEV groups, respectively. The effect on live weight was highly significant (p < 0001). After 126 days of fattening, the deleterious effect of the combination of Cooperia and Haemonchus in the IVM group on body weight was evident. Undetected animals carrying anthelmintic resistant (AR) worms entering the feedlot, could cause major productivity losses.
Fil: Fazzio, Luis Emilio. Facultad de Ciencias Veterinarias, Universidad Nacional de la Plata; Argentina
Fil: Sánchez, Ricardo O.. Laboratorio Mesopotámico de Diagnóstico Veterinario; Argentina
Fil: Streitenberger, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Facultad de Ciencias Veterinarias, Universidad Nacional de la Plata; Argentina
Fil: Galvan, Walter Ruben. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Facultad de Ciencias Veterinarias, Universidad Nacional de la Plata; Argentina
Fil: Giudici, Claudio J.. Universidad Nacional de Rosario; Argentina
Fil: Gimeno, Eduardo Juan. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Facultad de Ciencias Veterinarias, Universidad Nacional de la Plata; Argentina
Subject
ANTIHELMINTIC RESISTANCE
CALVES
COOPERIA
FEEDLOT
IVERMECTIN
RICOBENDAZOLE
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/37197