In domestic industry, Sometimes, chicken infects to newcastle disease in spite
of vaccinated chicken to Newcastle disease vaccine. It's believed that chicken to
have maternal immunity has poor antibody formtion.
The purpose of the present experimen...
In domestic industry, Sometimes, chicken infects to newcastle disease in spite
of vaccinated chicken to Newcastle disease vaccine. It's believed that chicken to
have maternal immunity has poor antibody formtion.
The purpose of the present experiments is to determine proper newcastle disease
vaccinaton time of new hatched chicken.
The results obtained are summarized as follows;
1. The higher HI titer is to lower immunity of chicken to vaccination.
2. The yielding of HI titer of chicken depends on the mother hen’'s HI titer.
3. The higher than HI titer 50 in chicken fails to prodnce immune response to
newcastle disease.
The lower that HI titer 50 is the excelent producing response to newcastle
disease.
4. The time to vaccination of chicken depends on mother hen''s HI titer when
laying egg.