Chicken louse

The genus Goniocotes belongs to the order Phthiraptera and the family Philopteridae. These insects are obligate ectoparasites of domestic and wild birds. Unlike blood-feeding parasites, they are chewing lice that feed exclusively on keratinized feather particles and skin dander, living their entire life cycle on the host bird.

This pest is a common concern in poultry farming, affecting chickens, turkeys, and occasionally ornamental birds. The lice are typically found deep within the plumage, specifically in areas such as the wings, vent, and back, where they find protection from the bird's preening habits and maintain the necessary microclimate for survival.

The biology of Goniocotes involves incomplete metamorphosis. Females attach their eggs, known as nits, to the barbules of the feathers. The development from egg to nymph and then to an adult occurs entirely on the host. These parasites are host-specific and cannot survive long off the bird, which usually limits infestation to direct bird-to-bird contact.

The damage caused by these lice leads to a condition known as mallophagosis. Infested birds experience severe itching, restlessness, and loss of appetite. Chronic infestations lead to damaged plumage, reduced egg production, and overall poor health. In young birds, the stress from the constant irritation can significantly hamper growth and development.

Control measures primarily rely on the application of approved insecticides to the birds, such as dusts, sprays, or spot-on treatments. Maintaining high sanitary standards in the coop, including regular cleaning and disinfection of nesting boxes and floors, is essential to break the life cycle. Providing dust bath areas with wood ash or sand is a recommended management practice for non-chemical prevention.