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The Ultrastructural Effect of Amprolium Medication on Development of Eimeria adenoeides in Turkeys

H. D. Danforth and W. I. Anderson
Avian Diseases
Vol. 33, No. 2 (Apr. - Jun., 1989), pp. 303-309
DOI: 10.2307/1590848
Stable URL: http://www.jstor.org/stable/1590848
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Ultrastructural Effect of Amprolium Medication on Development of Eimeria adenoeides in Turkeys
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Abstract

The ultrastructural appearance of first-generation schizonts of Eimeria adenoeides was markedly altered in turkey poults fed 0.0125% amprolium-medicated feed. When compared with development seen in unmedicated control birds 48-72 hr postinoculation (PI), most of the schizonts present in the medicated birds were fragmented, contained enlarged nuclei, had swollen endoplasmic reticulum and Golgi apparatus, and showed no budding of merozoites. Other schizonts were almost completely degenerated and contained pyknotic nuclei, dense cytoplasm, and large intracytoplasmic vacuoles containing membrane whorls or lipid droplets. A few mature schizonts were seen in the medicated poults, and these did not appear to differ ultrastructurally from those seen in unmedicated control birds. Ultrastructurally normal second-generation schizonts and the sexual stages were also seen in small numbers in the medicated turkey poults 72-120 hr PI. Mature sexual stages were seen much earlier in medicated turkeys-at 96 hr PI-than in the unmedicated poults. /// La apariencia ultraestructural de la primera generación de esquizontes de Eimeria adenoeides fue marcadamente alterada en pavitos alimentados con alimento medicado con amprolio al 0.0125%. Comparado con el desarrollo observado en las aves controles no medicadas, a las 48-72 horas después de la inoculación, las aves medicadas tenían la mayoría de los esquizontes fragmentados, con un núcleo agrandado y con inflamación del retículo endoplásmico y del apartato de Golgi, sin mostrar multiplicación de los merozoitos. Otros esquizontes estaban casi completamente degenerados y tenían núcleos picnóticos, citoplasmas densos y grandes vacuolas intracitoplasmáticas que contenían membranas en espiral y gotas de lípidos. En los pavitos medicados se observaron unos pocos esquizontes maduros, siendo estos ultraestructuralmente similares a los observados en las aves controles no medicadas. A las 72-120 horas después de la inoculación, en los pavitos medicados se observó ultraestructuralmente un pequeño número de esquizontes normales de segunda generación y formas sexuales. En los pavos medicados, las formas sexuales maduras fueron observadas mucho más temprano (a las 96 horas después de la inoculación) que en los no medicados.

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