Evaluación de la resistencia antihelmíntica de nemátodos gastrointestinales en ovinos de Costa Rica
Fecha
2009-08-17
Autores
Maroto Corella, Randal
Título de la revista
ISSN de la revista
Título del volumen
Editor
Universidad Nacional, Costa Rica
Resumen
Con el objetivo de detectar la resistencia antihelmíntica a los bencimidazoles y a las
lactonas macrocíclicas en nemátodos de ovinos, se realizó un estudio en 7 fincas de Costa
Rica. Por medio de la técnica de reducción en el conteo de huevos (FECRT, por sus siglas
en ingles) fue determinada la resistencia al albendazol y al ivermectina (inyectable). La
descripción del manejo general y del control antihelmíntico mediante encuestas fue
aplicada a 21 fincas. La población nacional de ovinos estuvo representada por 6765 ovinos,
y 36 granjas comerciales, distribuidas principalmente en Guanacaste (el 43%, el 44%) y
Puntarenas (el 29%, el 22%), respectivamente. A nivel de finca la resistencia al albendazol
fue de 85.7% y de 71.43% a la ivermectina. A nivel de parásito Haemonchus spp. (71%),
Strongyloides sp. (57%) y Trichostrongylus spp. (43%) fueron resistentes al albendazol,
mientras que Strongyloides sp. (43%), Haemonchus spp. (29%) y Trichostrongylus spp.
(29%) lo fueron a la ivermectina. Por primera vez se reporta Chabertia sp. en ovinos de
Costa Rica, y se determina la resistencia de Strongyloides sp. a ambos productos.
Este estudio sugiere que las frecuencias de aplicación mayores de 3 veces por año, junto
con el cálculo subjetivo de la dosis por peso, fueron de los principales factores que
pudieron haber favorecido los niveles de resistencia en las fincas analizadas.
A study was carried out to detect the anthelmintic resistance to benzimidazole and macrocyclic lactone in nematodos parasites of sheep, to determine the management practices and anthelmintic control, on 7 farms from Costa Rica. By means of the technique of the faecal egg count reduction test (FECRT) resistance was determined to albendazole and ivermectin (injectable). The management and anthelmintic control was obtained by questionnaire applied on 21 farms. The national population of sheep was 6765 with 36 commercial farms distributed mainly in Guanacaste (43%, 44%) and Puntarenas (29%, 22%), respectively. At farm levels the resistance to albendazole was 85.7% and 71.43% to ivermectin. At parasite level Haemonchus spp. (71%), Strongyloides sp. (57%) and Trichostrongylus spp. (43%) presented resistance to albendazol, whereas Strongyloides sp. (43%), Haemonchus spp. (29%) and Trichostrongylus spp. (29%) to ivermectin. For the first time it is reported Chabertia sp. in sheep from Costa Rica, however resistance is determined to Strongyloides sp. with both drugs. This study suggests that application frequency for both products > 3 times per year, the subjective calculation of doses by weight were main factors that could favor the high levels of resistance on the farm analyzed.
A study was carried out to detect the anthelmintic resistance to benzimidazole and macrocyclic lactone in nematodos parasites of sheep, to determine the management practices and anthelmintic control, on 7 farms from Costa Rica. By means of the technique of the faecal egg count reduction test (FECRT) resistance was determined to albendazole and ivermectin (injectable). The management and anthelmintic control was obtained by questionnaire applied on 21 farms. The national population of sheep was 6765 with 36 commercial farms distributed mainly in Guanacaste (43%, 44%) and Puntarenas (29%, 22%), respectively. At farm levels the resistance to albendazole was 85.7% and 71.43% to ivermectin. At parasite level Haemonchus spp. (71%), Strongyloides sp. (57%) and Trichostrongylus spp. (43%) presented resistance to albendazol, whereas Strongyloides sp. (43%), Haemonchus spp. (29%) and Trichostrongylus spp. (29%) to ivermectin. For the first time it is reported Chabertia sp. in sheep from Costa Rica, however resistance is determined to Strongyloides sp. with both drugs. This study suggests that application frequency for both products > 3 times per year, the subjective calculation of doses by weight were main factors that could favor the high levels of resistance on the farm analyzed.
Descripción
Modalidad: Tesis
Palabras clave
OVINOS, NEMATODA, PARASITOLOGIA VETERINARIA, DIAGNOSTICO (MEDICINA VETERINARIA), COSTA RICA