Effect of humic acid and probiotics on immunity of broiler chickens.

Background: The immune system in chickens has a fundamental role in controlling many diseases based on vaccination, thus enhancement of the immune system response is a priority.

Aim: The aim of this experiment was to study the effect of probiotics and humic acid on immunity of broiler chickens.

Methods: Day-old 300 Ross broiler chicks were segregated into 5 groups of 60 chicks per group.