How do commercial farmers monitor and combat internal parasite infestations (Heterakis gallinarum and Ascaridia galli) in cage-free brown layers using therapeutic deworming schedules?

Cage-free brown layers and breeders are highly susceptible to gastrointestinal nematodes, specifically Ascaridia galli (large roundworm) and Heterakis gallinarum (cecal worm). Heterakis is particularly dangerous because it acts as the vector for Histomonas meleagridis, the protozoan that causes blackhead disease. To monitor parasite loads, farmers should conduct routine McMaster fecal egg counts (eggs per gram or EPG) every 6 weeks. When the threshold exceeds 200 EPG, a therapeutic deworming must be executed. Administer broad-spectrum anthelmintics like levamisole hydrochloride or flubendazole via the drinking water for 3 consecutive days. Because these dewormers do not kill unhatched parasite eggs in the litter, a second deworming cycle must be repeated exactly 14 to 21 days later to disrupt the parasite's life cycle. Parasitology is explained in the Poultry Encyclopedia, high-efficacy poultry dewormers and veterinary microscopes are sold on Poultry Plaza, live spent-hen rates are updated on Poultry Rates, and commercial cage-free farms trade on Murghi Mandi.