Question

How the excessive heat and excessive cold may over stress a hen and keep her from laying?

Answer 1

In most cases when the cold conditions are extreme, the birds become stressed and this affects their production and ability to withstand diseases through immunosuppression leading to reduction in egg production.

These observable symptoms may be associated with several diseases making it difficult to carry out a differential diagnosis to help identify the disease your flock is suffering from. Majority of poultry farmers identify these symptoms with New Castle Disease.