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1 September 2013 Protecting Chickens Against Coccidiosis in Floor Pens by Administering Eimeria Oocysts Using Gel Beads or Spray Vaccination
Mark C. Jenkins, Carolyn Parker, Celia O'Brien, Joseph Persyn, Darren Barlow, Katarzyna Miska, Raymond Fetterer
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Abstract

Control of avian coccidiosis is increasingly being achieved by the administration of low doses of Eimeria oocysts to newly hatched chicks. The purpose of this study was to test the efficacy of gel beads containing a mixture of Eimeria acervulina, Eimeria maxima, and Eimeria tenella oocysts as a vaccine to protect broilers raised in contact with litter. Newly hatched chicks were either sprayed with an aqueous suspension of Eimeria oocysts or were allowed to ingest feed containing Eimeria oocysts-incorporated gel beads. Control, 1-day-old chicks were given an equivalent number of Eimeria oocysts (103 total) by oral gavage or received no vaccine (nonimmunized controls). All chicks were raised in floor-pen cages in direct contact with litter. At 4 wk of age, all chickens and a control nonimmunized group received a high-dose E. acervulina, E. maxima, and E. tenella challenge infection. Chickens immunized with Eimeria oocysts in gel beads or by spray vaccination displayed significantly (P < 0.05) greater weight gain (WG) compared to nonimmunized controls. Feed conversion ratio (FCR) also showed a significant (P < 0.05) improvement in both groups relative to nonimmunized controls. Moreover, WG and FCR in both groups was not significantly different (P > 0.05) from chickens immunized by oral gavage or from nonimmunized, noninfected controls. Oocyst excretion after Eimeria challenge by all immunized groups was about 10-fold less than in nonimmunized controls. These findings indicate that immunization efficacy of gel beads and spray vaccination is improved by raising immunized chicks in contact with litter.

Protección de los pollos contra la coccidiosis en corrales de piso mediante la administración de ooquistes de Eimeria utilizando perlas de gel o por vacunación en aerosol.

El control de la coccidiosis aviar se lleva a cabo cada vez más mediante la administración de dosis bajas de oocistos de Eimeria a pollitos recién nacidos. El propósito de este estudio fue evaluar la eficacia de las perlas de gel que contienen una mezcla de ooquistes de Eimeria acervulina, Eimeria maxima y Eimeria tenella como una vacuna para proteger pollos criados sobre cama. Pollitos recién nacidos fueron ya sea sometidos a aerosoles con una suspensión acuosa de ooquistes de Eimeria o se les permitió ingerir alimentos que contenían ooquistes de Eimeria incorporados en perlas de gel. A los pollos de un día de edad del grupo control, se les administró un número equivalente de ooquistes de Eimeria (103 en total) por sonda oral o no recibieron ninguna vacuna (controles no inmunizados). Todos los pollos fueron criados en corrales en contacto directo con la cama. A las cuatro semanas de edad, todos los pollos y el grupo control no inmunizado fueron desafiados con una dosis alta de E. acervulina, E. maxima y E. tenella. Los pollos inmunizados con ooquistes de Eimeria en perlas de gel o mediante vacunación por aerosol mostraron una mayor ganancia de peso, de manera significativa (P <0.05), en comparación con los controles n

American Association of Avian Pathologists
Mark C. Jenkins, Carolyn Parker, Celia O'Brien, Joseph Persyn, Darren Barlow, Katarzyna Miska, and Raymond Fetterer "Protecting Chickens Against Coccidiosis in Floor Pens by Administering Eimeria Oocysts Using Gel Beads or Spray Vaccination," Avian Diseases 57(3), 622-626, (1 September 2013). https://doi.org/10.1637/10516-022213-Reg.1
Received: 12 March 2013; Accepted: 1 April 2013; Published: 1 September 2013
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