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Radiographic Diagnosis of Tibial Dyschondroplasia in Broilers: A Field Selection Technique

J. E. Bartels, G. R. McDaniel and F. J. Hoerr
Avian Diseases
Vol. 33, No. 2 (Apr. - Jun., 1989), pp. 254-257
DOI: 10.2307/1590840
Stable URL: http://www.jstor.org/stable/1590840
Page Count: 4
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Radiographic Diagnosis of Tibial Dyschondroplasia in Broilers: A Field Selection Technique
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Abstract

A technique for early detection of tibial dyschondroplasia (TD) in live broilers was developed using the Lixiscope, a hand-held, real-time skeletal imaging device. The Lixiscope utilizes 125 I gamma energy (27 keV), which is converted to electrons and then to visible energy, for imaging by way of an output phosphor or electron-to-photon conversion. Image amplication is 45,000 to 50,000 times, and image resolution is 4.2 line pairs per millimeter. The left and right tibiotarsi of the parent stock of male broiler breeder chickens were examined at 3, 4, 6, and 8 weeks of age. The images readily allowed for the detection of TD. A scoring system was established to assess severity of TD and was confirmed accurate as correlated with direct radiography and macroscopic examination at necropsy. This technique offers a quick, non-invasive, early detection of TD in broilers. The equipment is portable and can be used in field selection procedures. /// Se desarrolló una técnica para la detección temprana de la discondroplasia tibial en pollos de engorde vivos, usando un aparato manual para detectar la imagen del esqueleto, llamado lixiescopio. Este aparato utiliza energía gama 125 I (27 keV) que es convertida a electrones y luego a energía visible. La imagen es amplificada 45 a 50.000 veces y la resolución de la imagen es 4.2 pares de líneas por mililitro. Los tibiotarsos izquierdo y derecho de progenitores de reproductores de engorde machos fueron examinados a las 3, 4, 6 y 8 semanas de edad. Las imágenes permitieron la detección rápida de la discondroplasia tibial. Se estableció un sistema de valores para evaluar la severidad de la discondroplasia tibial, con la confirmación precisa de acuerdo a la correlación con la radiografía directa y el examen macroscópico a la necropsia. Esta técnica permite la detección temprana y rápida de la discondroplasia tibial en pollos de engorde. El equipo es portable y puede usarse en los procedimientos de selección a nivel de campo.

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