Banca de QUALIFICAÇÃO: JOSÉ EMÍLIO DE MENEZES DIAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOSÉ EMÍLIO DE MENEZES DIAS
DATE: 02/12/2022
TIME: 09:30
LOCAL: Web Conferência - Google Meet: meet.google.com/hep-fyaf-hah.
TITLE:

Genetic characterization of Gumboro disease virus strains with molecular patterns distinct from vaccines strains present in chickens in the state of Paraná.

KEY WORDS:

Bursa of Fabricius; RFLP; Genogroup 4; G15.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

Gumboro disease virus belongs to the Birnaviridae family and to the Avibirnavirus genus, and this agent continually represents a challenge for world poultry production. In South America, viral strains with molecular patterns distinct from vaccines strains were found in commercial broiler flocks. The present study aimed to carry out an epidemiological study of the Gumboro virus in commercial broiler flocks in the state of Paraná (main chicken producing state in Brazil), genotyping of Gumboro virus strains and to correlate it with lesions found in organs of the immune system. Were evaluated 30 broiler flocks with an average of 24,949 birds per flock, aged between 18 and 23 days. Five samples of Bursa of Fabricius were collected per flock for virus detection and genotyping. Positive samples for Gumboro virus with RFLP distinct from the vaccine strains were subjected to the sequencing. Five samples of Bursa of Fabricius, thymus, spleen, cecal tonsils and bone marrow were also collected per flock for histopathological analysis. Of the 30 flocks evaluated, in 10 (33%), Gumboro viral strains with RFLP distinct from the vaccine’s strains were found. Lesion at Bursa of Fabricius varied according to the viral strains detected. Flocks infected by strains with a distinct molecular pattern showed higher mean mortality (9.20%) than positive flocks for M.B. vaccine strain (4.74%) or flocks with negative samples (6.44%). Flocks infected by strains with a distinct molecular pattern showed lower production efficiency index (368) than flocks positive for M.B. vaccine strain (400) and flocks with negative samples (408).

COMMITTEE MEMBERS:
Presidente - ***.057.669-** - BRENO CASTELLO BRANCO BEIRÃO - UFPR
Interno - 2613308 - DELANO DIAS SCHLEDER
Interna - 1046884 - ELIZABETH SCHWEGLER
Interno - 1810731 - JULIANO SANTOS GUERETZ
Interno - 2017813 - RICARDO EVANDRO MENDES
Interna - 2408296 - SORAYA REGINA SACCO