Abstract
Investigations on the invasion of hens in different groups in the farms are carried out. It was found out that the most common invasions are Аscaridia galli, Heterakis gallinarum, Syngamus trachea, Raillietina tetragona and Capillaria obsignata. The highest rates of intensity and extensity of invasion were in 2-4 monthly hens with Аscaridia galli, Syngamus trachea, Capillaria obsignata and Raillietina tetragona, and in hens aged 6-8 months - Heterakis gallinarum. The highest invasion among hens was in summer.
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