EvaluaciÓN de la protecciÓn conferida por un programa de vacunaciÓn contra la enfermedad de gumboro en pollos de carne aplicando la fÓrmula deventer

Translated title of the contribution: Evaluation of the level of protection conferred by a vaccination scheme against the infectious bursal diseasein broilers using the deventer formula

V. Walter Paredes, D'A Eliana Icochea, Nieves Nancy Sandoval Chaupe, S. Alberto Manchego

Research output: Contribution to journalArticlepeer-review

Abstract

The present study evaluated the conferred protection by a program of vaccination at an age that was determined by the Deventer formula against a challenge with a standard strain of the Infectious Bursal Disease virus (IBDV) in broiler chickens. There were three experimental groups. The group A was vaccinated at 10 daysof age with a Lukert strain (intermediate-mild) and at 18 days with CE strain (intermediate-intermediate); group B vaccinated at 21 days old (according to the Deventer formula) with the 228TC strain (intermediate-intermediate); and group C were not vaccinated (control). At 35 days of age, 45 birds of each group were challenged with a standard strain F 52/70 of the IBDV. The protection was measured through clinical signs, bursal index (B.I.), gross and microscopic lesions, and serology. All groups presented clinical signs and bursal oedema until 10 days post challenge. The values of B.I. in the three groups were compatible with bursal atrophy and the histopathology lesions were severe in the vaccinated groups. Seroconversion was not observed until the end of the study. The obtained results indicated that birds in none of the experimental groups were protectedagainstthe clinical disease until 10 days post challenge. The best protection was observed in the group A in comparison group B but without statistical difference.

Translated title of the contributionEvaluation of the level of protection conferred by a vaccination scheme against the infectious bursal diseasein broilers using the deventer formula
Original languageSpanish
Pages (from-to)81-89
Number of pages9
JournalRevista de Investigaciones Veterinarias del Peru
Volume20
Issue number1
StatePublished - 2009
Externally publishedYes

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