How do I recognise and manage coccidiosis in a broiler flock?

Coccidiosis is a common cause of a mid-cycle growth check in broilers. Veterinary extension guidance on poultry enteric disease places the typical risk period around two to five weeks. Watch for huddling, ruffled feathers, reduced feed and water intake, wet or blood-flecked droppings, and a widening spread of bird weights. These signs raise suspicion but do not confirm coccidiosis; other gut diseases can look similar, and blood is not always present.

Check the flock promptly and record daily deaths, feed intake, water use and where affected birds are found. Ask a poultry veterinarian about examination of fresh droppings and post-mortem assessment. Sudden bloody droppings with rising deaths warrants same-day professional advice rather than self-medication. Treatment of an active outbreak is a veterinary decision; follow the prescribed product directions and meat withdrawal requirements.

While arranging advice, maintain continuous access to clean water and make feed easy to reach. Breed management guides and poultry welfare practice recommend keeping litter dry, friable and loose enough to crumble in the hand. Fix leaking or poorly adjusted drinkers, remove wet cake and replace it with dry litter, and ventilate to remove moisture as well as heat. Correct crowding and avoid moving contaminated litter or equipment between houses.

In the example of 2,000 Cobb 500 broilers on deep litter in a naturally ventilated house at 33C, the stated 10 birds/m2 and 200 m2 floor area do not by themselves establish that conditions are suitable. Inspect drinker areas and litter closely, and assess humidity and airflow: FAO and breed-guide heat stress guidance notes that intake and growth can fall above roughly 30C, so heat stress may coexist with enteric disease. The example's 5.5% background mortality is not a diagnostic threshold or a reason to accept a new rise in deaths.

For future batches, agree on a locally appropriate vaccination or in-feed prevention programme with your veterinarian or poultry adviser; these must be coordinated rather than combined casually. FAO and WOAH smallholder biosecurity guidance supports all-in all-out batches, thorough cleaning and a genuine rest between flocks, dedicated house footwear, and daily removal and safe disposal of dead birds. Remove spent litter fully between batches and review any outbreak before restocking.