Banca de DEFESA: KEILA CATARINA PRIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KEILA CATARINA PRIOR
DATE: 29/07/2021
TIME: 09:30
LOCAL: Webconferência via Google Meet - meet.google.com/vet-zend-tyx
TITLE:

Risk factors associated with failures in the immunization against the avian encephalomyelitis virus in productive chains of poultry farming.

KEY WORDS:

poultry farming; encephalomyelitis; vaccine failure; immunity; ELISA.

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

Avian Encephalomyelitis (AE) is characterized as a disease that affects chickens, turkeys, quails and pheasants. In young animals, it usually causes neurological signs, such as ataxia and tremors. In laying birds, it manifests itself with a sharp drop in egg production and low hatchability. The objective of this work, was to identify factors that influence the occurrence of vaccine failures for AE in production chains of poultry farming. For this, information from a database was analyzed of 65,535 bird serum samples, collected from 2015 to 2019 and tested through the indirect enzyme-linked immunosorbent assay (ELISA). Information such as: immune status, age of birds, year of sample collection, type of productive chain, city of origin and egg laying phases were evaluated. Data evaluation was performed using chi-square analyses, analysis of variance and odds ratio. It was possible, to determine that there is a statistical difference, between frequency of seroprotected animals and the type of production chains in relation, the age of the birds, as well as within the matrices chain, where some geographical areas exhibited 2,10 times more chances to present non-proteted birds against AE, showing possible management problems. Furthermore, it was found that, there was a progressive improvement in flock’s immunity over the years and that the pre-posture and onset posture phase are the ones with the best humoral immunity rates for EA compared to the others. The present study demonstrated that several factors may be involved with vaccine failures for EA, and actions are necessary to improve the humoral response.

BANKING MEMBERS:
Interna - 1989957 - ALESSANDRA FARIAS MILLEZI
Presidente - 1756086 - DIOGENES DEZEN
Externa à Instituição - IARA TREVISOL - EMBRAPA