You can read this article , I hope it Enough

thank you Dr. Alaa

 http://www.merckvetmanual.com/poultry/nutrition-and-management-poultry/vaccination-programs-in-poultry

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&cad=rja&uact=8&ved=0ahUKEwjOysaWxNrTAhWKZVAKHQGyBEkQFghaMAY&url=https%3A%2F%2Fwww.oie.int%2Fdoc%2Fged%2FD4243.PDF&usg=AFQjCNHBJYKYtRjXVxhtK5kWEencpdbVVw&sig2=b7O_T7IluiL1ZHODavwF2A

All thx

Dear Dr

this important link 

http://www.merckvetmanual.com/poultry/nutrition-and-management-poultry/vaccination-programs-in-poultry

Dear Dr. K. Chelab

I'm grateful for your answer

I hope the below article will help you

https://www.google.iq/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj88MfCze7TAhUnIsAKHTmYB6IQFggoMAA&url=http%3A%2F%2Fwww.poultry-health.com%2Flibrary%2Fcargilljohnson0612.htm&usg=AFQjCNFVtiTmjMf9yefoe8f-zZZfIF1lSQ

thanks a lot Dr. Balsam for your answer

It's a big question...

hi

Hi, Dr. Moshtaq

Hi Dr. Muthanna

I have your answer in three points

thanks

hi see this attach 

thank you Dr. N.E. Jarad

All thanks

good question

Hi

Dr. Heba so Dr. monyer

thanks a lot

Hi

I agree with Dr. Alaa

regards

These link may be help you www.poultry-health.com/library/cargilljohnson0612.htm

Dear Dr. Furqan

I'm grateful

thx a lot

Dear Dr. Atiaf

this link is very useful

thanks a lot

Hello Dr

This important link

http://www.merckvetmanual.com/poultry/nutrition-and-management-poultry/vaccination-programs-in-poultry

Dear Dr. Khalil

thanks a lot.

Hassan

Hi Dr.

It provide local immunity for Respiratory system, sometime become predisposing factor for some these diseases. Regards