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Effect of Induced Molting on the Susceptibility of White Leghorn Hens to a Salmonella enteritidis Infection

Peter S. Holt
Avian Diseases
Vol. 37, No. 2 (Apr. - Jun., 1993), pp. 412-417
DOI: 10.2307/1591667
Stable URL: http://www.jstor.org/stable/1591667
Page Count: 6
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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.
Effect of Induced Molting on the Susceptibility of White Leghorn Hens to a Salmonella enteritidis Infection
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Abstract

Older white leghorn hens (more than 52 weeks old) were induced to molt using a 14-day feed-removal protocol. On day 4 of feed removal, groups of hens were infected with varying 10-fold dilutions of Salmonella enteritidis, and these hens were examined for S. enteritidis intestinal shedding 7 days later. Molting hens infected with a ID50 dilution of S. enteritidis shed 3-4 logs more of the organism at 7 days postinfection than the unmolted group receiving a similar dose. The mean infectious dose ( ID50) for S. enteritidis in unmolted hens ranged from 0.65× 104 to 5.6× 104, whereas in molting hens the ID50 was found to be less than 101, a 2-3 log increase in the susceptibility of the hens to the organism. /// Se indujo la muda forzada en gallinas adultas (mayores de 52 semanas de edad) usando el sistema de retiro del alimento durante 14 días. En el día 4 del período de retiro del alimento, se infectaron grupos de gallinas con diferentes diluciones de Salmonella enteritidis y se examinó la eliminación fecal de S. enteritidis 7 días más tarde. Las gallinas sometidas a muda forzada que fueron infectadas con una dilución de 10-2 organismos de S. enteritidis eliminaron 3-4 logaritmos más organismos a los 7 días post-infección que las gallinas que no fueron sometidas a muda forzada y que recibieron la misma dosis. La dosis media infectante ( ID50) para S. enteritidis de las gallinas no sometidas a muda forzada varió de 0.65× 104 a 5.6× 104, mientras que en las gallinas sometidas a la muda forzada fue menor de 101, un incremento de 2-3 logaritmos en la susceptibilidad de las gallinas a la Salmonella.

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