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handle: 10261/89718
[ES]En este trabajo, se ha probado en condiciones de laboratorio y de campo el efecto nematocida que sobre los elementos libre de Ostertagia Ostertagi, transmisibles a través de los pastos, presenta un grupo de abonos minerales del mercado español, empleados en praticultura. De los resultados obtenidos, es de destacar que en condiciones naturales, sobre pequeñas parcelas de pasto artificialmente contaminadas, a dosis de 300 Kg/Ha., al cabo de 10 dias, la Urea redujo en un 68% el número de larvas infestantes del parásito. Cifras próximas al 50 y 60% de reducción se observaron con el empleo de los complejos 5-10-20 y 0-14-17 respectivamente. Un efecto larvicida relativamente pequeño mostró el compuesto 4-12-8, y resultaron prácticamente ineficaces la Caliza y el Superfosfato de Cal al 18%. Con la discusión de los resultados se hacen las consideraciones pertinentes sobre el significado de estas investigaciones por cuanto puedan representar en el contexto de la profilaxis de algunas parasitosis de los rumiantes en explotaciones extensiva y mixta
[EN]In these experiments it has been tested the nematocial effect of a group of spanish inorganic fertilizers, for application to pastures, on the freeliving larvae of Ostertagia ostertagi. The work was carried out in field experiments and under laboratory conditions. The small plots of pasture articially contaminated, Urea at a dose of 300 Kg/Ha., reduced in 68 % the number of infective larves. Figures about 50-60% of reduction using 5-10-20 and 0-14-17 complexes respectively were observed. Compound 4-12-8 shows relatively little effect and practically no effect was obtained with Lime and Superphosphate at 18%. The significance of the results of these experiments, in relation to prophylasis of some parasitosis which ocurred in ruminants mantained in extensive and semi-extensive systems, are discussed.
10 páginas, 3 figuras
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