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Some articles and publications posted to this website refer to Intervet/Schering-Plough Animal Health, which has since changed its name to Merck Animal Health.

Roundworms

Roundworms. or ascarids, can occur in both chickens and turkeys. Heavily infected birds may appear droopy or emaciated and may experience diarrhea. The primary problem caused by roundworms is reduced feed utilization, though death may occur in severe cases.

Adult roundworms are large enough to be seen with the naked eye. They can range in size from 1½ to 3 inches long and have the girth of pencil lead.

Female roundworms lay thick, heavy-shelled eggs in the intestine that pass in the feces. A small embryo develops in the egg but does not hatch immediately. The larva in the egg reaches infective stage within 2 to 3 weeks. These eggs are ingested by birds pecking in the litter.

Safe, field-proven feed additives are available to treat adult roundworms. The parasite can also be controlled by strict sanitation. The house must be cleaned thoroughly and completely, particularly before a new group of birds arrives. Disinfectants and other cleaning agents do not readily kill the eggs.