Efficacy of Live attenuated and Inactivated Oil Emulsion
Infectious Bursal Disease Virus Vaccines in Broiler chicks
Nazir Ahmed Lone*, Shafqat Fatima Rehmani1, Taseer Ahmed
Khan2 and Shahana Urooj Kazmi3
Department of Environmental Sciences, Karakoram International
University, Gilgit-Baltistan, 15100;
1WTO
Quality Operation Laboratory, University of Veterinary and Animal
Sciences, Lahore; 2Poultry Research Laboratroy,
Department of Physiology;
3Department
of Microbiology, University of Karachi-75270, Pakistan
*Corresponding author: dr.nazir@kiu.edu.pk
Abstract
This study was carried out with the aims to evaluate the efficacy of indigenous
live and inactivated Infectious bursal disease virus (IBDV) vaccines in
broilers. Two hundred and fifty (250), a-day-old broiler chicks divided into
five groups (A-E) were immunized with live and inactivated vaccine at varying
ages. Live vaccine was given to group A (at 8 days post hatch), B (at 8, 15 days
post hatch), C (at 8, 15 and 23 days post hatch) and D (at 8 days post hatch).
In addition group D received at booster dose of inactivated at 21 days of age,
while group E served as control. Antibody titers were measured via Agar Gel
Precipitation (AGP) test and ELISA, while the degree of protection against the
virulent strains of IBDV was also recorded. Results showed that vaccine program
adopted for group C and D produced significantly (P<0.05) higher antibody titer
as compared to other groups. While a significant (P<0.05) difference in antibody
titers was observed between group A and B while no considerable antibodies were
detected in group E. The response to
challenge dose was recorded as the difference of lesions in bursa, pectoral
muscles or other visceral organs with the exception of group C and D. The study
suggests that broiler chicks may be vaccinated at days 8, 15 and 23 with live
attenuated vaccine or live attenuated vaccine followed by inactivated vaccine at
days 8 and 21 that could provide an adequate protection against the virulent
form of IBDV.