Vaccination against infectious bronchitis in young chickens--carriers or not of maternal antibodies |
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| Authors: | V Marius J P Gillet R L'Hospitalier M Guittet G Bennejean |
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| Institution: | Ministère de l''Agriculture, Direction de la Qualité, Services Vétérinaires Laboratoire National de Pathologie Aviaire, Station Expérimentale d''Aviculture, B.P. No 9-22440 Ploufragan, France |
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| Abstract: | The immunity to infectious bronchitis afforded by spray vaccination of mycoplasma free two days-old broilers with maternal antibodies to infectious bronchitis virus was tested by comparing zootechnical scores, clinical signs, macroscopical and microscopical changes, frequency of infectious bronchitis virus isolation following challenge at one, three and five weeks of age in vaccinated, unvaccinated, challenged and unchallenged birds. This vaccination gave a very good protection to infectious bronchitis for the most part of broiler economical life; growth delays were especially avoided. However, vaccinated and unvaccinated one-week-old birds were not protected enough. No correlation was observed between haemagglutinating antibodies titres and protection. At last this vaccination caused a notable reaction in specific pathogen free control birds of the same age. |
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| Keywords: | Anticorps maternels bronchite infectieuse Glande de Harder immunité inhibition de l'hemagglutination nébulisation performances zootechniques Maternal antibodies infectious bronchitis Harderian Gland Immunity haemagglutination inhibition test spray zootechnical scores |
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