On Day 11, the flock's metabolic demand accelerates dramatically. Birds produce more respiratory CO2, water vapor, and body heat. Farm managers must increase minimum ventilation fan run-times to purge stale air while implementing controlled pan empty-out periods (30–45 minutes) to clean pans and stimulate fresh feeding drive.
Allowing feed to sit continuously in pans creates fine powder buildup that birds reject, reducing intake. Insufficient ventilation at Day 11 causes carbon dioxide and moisture to accumulate at bird height, damping appetite and increasing ascites risk.
•Letting feed pans stay overflowing all day, leading to selective eating and rancid powder accumulation.
•Closing ventilation inlets too tightly to preserve heat, suffocating the flock with CO2 and moisture.
•Running minimum ventilation fans without adequate air inlet velocity, dumping cold air directly onto birds.
•Day 11 is a crucial window for respiratory monitoring. Inadequate minimum ventilation damages tracheal cilia and predisposes broilers to secondary E. coli airsacculitis.
•Veterinary Escalation Threshold: If respiratory snicking counts exceed 5 sounds per 100 birds in a 2-minute quiet listening test, contact your veterinary consultant for serological testing and diagnostic post-mortem.
•Turn off the lights for 5 minutes during your night check and stand completely still in the center of the shed. Listen carefully for faint wheezing or coughing that cannot be heard over running equipment.
•A short pan empty-out period sharpens flock appetite and ensures weak birds get equal access to fresh feed when the auger restarts.
This meal-time stimulation technique forces birds to eat the fine particles containing vital vitamins and amino acids, prevents feed souring in pans, and stimulates a synchronized feeding rush.
A standard Ross 308 / Cobb 500 broiler flock will consume approximately 86g per bird on Day 11.
Shed relative humidity should remain between 55% and 65%, carbon dioxide should stay below 2,500 ppm, and there should be zero ammonia odor at bird eye level.
Tomorrow, your operation reaches Day 12. The primary management objective will be:
Dismantle remaining brooding partitions to give full house floor access, conduct a litter moisture squeeze test (target <25%), and maintain 385g target weight.
