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handle: 10261/30207
[ESP]Se efectuaron pruebas para averiguar las acciones ovicida, larvicida y contra vermes adultos dd Oxibendazol con las especies Osterlogia ostertagi, Cooperia oncophora y C. McMasteri. Con dichas especies fueron infestadas en condiciones experimentalles 18 terneras jóvenes a las que fue aplicado el producto a la dosis única de 0,015 gjkg. de p.v. por via oral. La eficacia del Oxibendazol ha sido expresada en porcentajes de reducción,valorando en cada caso su significación estadística. La acción larvicida frente a larvas L4 incipientes de O. Ostertagi fue nula, pero frente a L4 avanzadas, de la misma especie, llegó al 51,18 %. En cambio contra los mismos tipos de L4 de Cooperia spp se lograron reducciones del 92,63 % y 100 %. La reducción de la puesta empezó a ser fuertemente significativa a partir de las 24 h.(89,42 %) y continuó elevándose a lar 48 h., 72 h. y 8 días. Sobre la viabilidad de los huevos recogidas desde las 12 h. a las 72 h. del tratamiento el Oxibendazol mostró una efectividad total (100 %). Como antihelmíntico frente a vermes adultos de las especies probadas, el producto fue capaz de reducir hasta d 99,14 % y 99,79 % de 0. ostertagi y Covperio spp respectivamente.
[ENG]Eighteen calves eight to nine months old experimenlally infected wilh autochthonous strains of Ostertogin ostertagi, Cooperia onccphora and Cooperin McMasteri, were treated at a single dose of 15 mg/kg body weight of Oxibendazol (metyl-5-n-proposy-2-benzimidazolcarbamate). The efficacy of the drug on reduction of egg counts, and on immature and mature worms was statistically evaluated. Reduction of egg counts was strongly significant from 24 h. (89,42 %) and continue at 48 h., 72 h. and 8 days. The action on the vitallity of the eggs was highly efficacious (100 %), on eggs collected at 12 h. and 72 h. after treatment. There was no activity againts early 4th stage larvae of O. ostertagi but on late 4th larvae of this worm reduction of 51,18 % was noted. On the same stages of Cooperia spp larvae reductions of 92,63 % and 100 % were obtained. Average reductions of adults worms reached high Ievels (99,14 % and 99,79 % on O. ostertagi and Cooperia spp respectively). Undesirable effects due to treatment were not observed.
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