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Evaluation of Newcastle disease antibody level after
different vaccination regimes in three districts of Amhara
Region, North-western Ethiopia
Hailu Mazengia1,
Esayas Gelaye2* and Mohamed Nega1
1Andasa
Livestock Research Center, P. O. Box 27, Bahir Dar,
Ethiopia.
2National
Veterinary Institute, P. O. Box 19, Debre zeit, Ethiopia.
*Corresponding author.
E-mail: egelaye@yahoo.com.
Accepted 17 November, 2009 |
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Evaluation of the Newcastle
Disease (NCD) antibody level after different vaccination
regime was conducted on chickens distributed at the age of
day-old in three districts of Amahara region using sera
analysis. Three vaccination regimes on chicks against
Newcastle using live lentogenic stains; Hitchener B1 (at the
age of day-old) and La Sota (at the age of 21st and 60th
days of age) were used. The overall antibody level of
Newcastle disease in vaccinated chickens using
Hemagglutination inhibition test (≥1:8) was 71.1% ranging
from 80.4, 73.3 and 63.3% in Dangila, Bahir Dar and Farta
districts respectively. Significant difference (p < 0.001,
df = 2, c2
= 13.3) in antibody level of Newcastle disease was found
among the three districts. The antibody level of Newcastle
disease in Lohmann White breeds (70.6%) was lower than that
of Red Island Red breeds (72.5%) but no significant
difference was detected between breeds (p > 0.05, df = 1,
c2
= 0.27). On the other hand, chickens vaccinated three times
at 1st , 21st and 60th day of age (78.8%) were found to have
higher protective antibody titer than chickens vaccinated
twice at 1st and 21st day of age (64.9%) and only at 1st day
of age (65.4%). There was significant difference (p < 0.05,
df = 2, c2
= 8.2) in antibody level of Newcastle disease among
different vaccination regime and frequencies. In conclusion,
the results of the present study indicated that the
protective antibody titer response was produced from these
vaccines after booster vaccinations. Hence, it is very
crucial to vaccinate chickens with the full dose of vaccines
against NCD in order to keep protected poultry population.
Key words: Antibody level, chickens, Ethiopia,
newcastle disease, vaccination response. |
