45 45 LOHMANN TIERZUCHT › MANAGEMENT GUIDE Health Parasites Parasites are a common problem in free range systems. Internal parasites which are easily ingested not only damage the intes- tinal tract but will affect the absorp- tion of nutrients from the feed, both of which can lead to a variety of issues: › Poor body weight gain and uniformity. › Increased susceptibility to challenges. › Loss of production. › Cannibalism and mortality. Common Parasites Roundworms: Ascaridia Galli › The most common. › Adults are often easy to see. › White-yellow in colour about 5–11 cm long. › Often found in the small intestine. Cecal worm: Heterakis gallinae › Small, white hard to see. › Will be found in the ceca. › Earthworms a vector. › Fairly harmless but can carry Histomonas Meleagridis which can lead to Blackhead. Hairworm: Capillaria › Lives in the small intestine and sometimes ceca. › Small and hard to see. Monitoring Worm eggs are often found in litter, soil and faeces. Routine monitoring should be under- taken either via worm egg counts or Post mortem. Chart showing monitoring Larvae and worms program