Understanding Seven-Day Mortality in Poultry Production
- 4 days ago
- 6 min read
Seven-day mortality is a major challenge across the poultry industry because early challenges affect more than livability. They can impact flock uniformity, long-term performance and the producer’s bottom line.
In poultry production, seven-day mortality refers to the total number of birds lost during the first seven days after placement. While every operation has its own benchmarks, first-week mortality near 1% is often the goal.
When losses climb above that level, it’s worth taking a closer look at chick quality, transportation, placement, barn environment and early gut health to understand where stress may have started.
Why the First Week Matters
The first week is when chicks make one of the biggest transitions of their life. They move from the hatchery to the barn, shift from yolk-based nutrients to feed and water and begin developing the gut function and immune response needed to support them for the rest of their life.
That transition needs to happen quickly. When chicks are slow to drink, slow to eat or uncomfortable in the brooding environment, they can fall behind before producers have much time to react. Dehydration, low feed intake, poor temperature regulation and early microbial pressure can all start as minor challenges, but build quickly during the first few days.
Overall, the first week is about helping chicks get off to a strong start to stay uniform, active and ready to perform as the flock grows.
What Causes Seven-Day Mortality?
Seven-day mortality can start before chicks ever reach the farm. Hatchery conditions, breeder flock health, egg handling, incubation, transportation and chick quality all play a role. Then, once chicks arrive, barn conditions and early management determine how well they make the transition.
That’s why it’s important to look at both sides of the issue: the factors producers can control and the factors they cannot.
1. Hatchery, Breeder and Transportation Factors
Chick quality starts well before placement. Breeder flock age and health, egg storage, hatchery sanitation and incubation conditions can all influence how chicks perform in the first week.
Chicks from younger breeder flocks may be smaller and need extra support. Chicks from older breeder flocks may face different egg quality or contamination risks. Incubation temperature, humidity and hatch timing can also affect hydration, navel quality and overall chick strength.
In commercial production, chicks don’t all hatch at the same time. Hatch can occur over a 24-to 48-hour window, and chicks often remain in the incubator until most of the hatch is complete. After that, they go through hatchery processing and transport before they are placed on the farm. Because of that timeline, chicks may go without feed and water for up to 72 hours under practical conditions. (1)
Transportation adds another layer of complexity. By the time chicks arrive, they may already be dealing with dehydration, temperature stress or low energy. Producers can’t control everything that happens before placement, but they can control how prepared the barn is when chicks arrive.
2. Placement
The first few hours after placement are when producers can quickly spot whether chicks are starting well or struggling.
Chicks should be alert, active and responsive. They should move and vocalize normally and begin spreading out comfortably once placed. Their down should be dry and fluffy. Their legs should look plump and well-hydrated. Navels should be clean and properly healed.
Chick behavior can also tell you a lot. If chicks are piling on top of one another, they may be cold. If they’re spread far away from heat or panting, they may be too hot. If they’re slow, sleepy or not finding feed and water, something needs attention.
One of the biggest goals at placement is simple: get chicks drinking and eating as soon as possible. Chicks that don’t find water may be less likely to start eating. Chicks that don’t start eating can fall behind quickly, especially during the first few days when their gut and immune systems are still developing.
That makes water setup an important placement detail. For nipple systems, it’s recommended to set the nipple pins at chick eye level on placement day, and from day two on raising the line as birds grow so chicks drink with a 45-degree angle. (2)
Flow rate matters too. Estimating adequate nipple flow rate can be done by multiplying bird age in weeks by 7 and adding 20 mL per minute, which means chicks in the first week generally need about 76 mL per minute. (3)
If the line is too high, chicks may struggle to activate the nipple. If flow rate is too low, they may not get enough water once they find it. If the line is too low or flow rate is too high, water waste and litter moisture can increase, which can also work against a strong start.
Lastly, water temperature can also affect intake. Peer-reviewed broiler research has shown that very warm drinking water can reduce body weight gain and feed consumption during brooding, while water below ambient air temperature may support better chick growth. (4)
3. Barn Environment
A strong brooding environment starts before chicks arrive. Preheating gives the barn time to warm not just the air, but also the equipment and litter the chicks will come into contact with at placement.
Floor temperature is especially important because chicks are living at litter level. A barn can feel warm at human height, but the litter may still be too cold where chicks are placed. Average floor temperature should be about 90°F on placement day. (5)
When litter is too cold, it can pull heat away from chicks. This can cause piling, reduce movement and make it harder for birds to find feed and water. Research shows chicks brooded at 90°F had better weight gain, feed conversion and livability than chicks brooded at 80°F, and birds started too cool didn’t fully catch up by market age. (5)
Lighting, chick density and feeder space also matter because chicks need to find resources quickly and settle into the brooding area without extra stress.
4. Ventilation, Moisture and Litter Quality
Ventilation during brooding isn’t about cooling birds. It’s about bringing in enough fresh air to manage moisture and air quality while keeping chicks comfortable.
Air mixing is key. Cold incoming air should not fall directly onto chicks. Inlets, fans and stir fans need to work together so fresh air mixes with warm house air before it reaches bird level.
Too little ventilation can lead to wet litter, ammonia buildup and poor air quality. As a general benchmark, ammonia should be kept below 20 ppm in poultry houses. (6) Levels above that can affect bird health and performance, and young chicks may be especially vulnerable because they are close to the litter surface where ammonia is being volatized (released into the atmosphere).
Litter quality is also a major part of first-week success. Wet litter can increase microbial pressure, contribute to ammonia release and make it harder to maintain the right temperature. Litter that is too dry and dusty can also contribute to respiratory irritation.
Between flocks, decaking, drying, windrowing and ammonia control can help reduce the microbial load going into the next flock. Windrowing can be useful, but only when it’s done correctly. Piling litter for too short of a time may not allow it to reach the temperature needed to reduce bacterial pressure.
Prompt mortality removal is another simple but important step. Removing dead chicks quickly helps reduce pathogen exposure and keeps the brooding environment cleaner.
Get Chicks Drinking & Support Early Gut Health
After the barn is ready, the next step is helping chicks drink, rehydrate and build a healthier gut environment as quickly as possible.
Avi-Lyte is a water additive that can be used from day one to support chicks during this critical first-week window. It provides electrolytes, vitamins, probiotics and acidification support to help encourage water intake, support hydration and promote early gut health.
Bottom-line, seven-day mortality is rarely caused by one issue, and producers can’t control every factor tied to it, but they can control the environment chicks enter and the support they receive once they arrive.
Want to learn more on seven-day mortality? Check out this Wing it Wisely podcast, where the Ralco poultry team dives deeper into why early losses happen and how gut health support can help chicks start stronger.
Looking to reduce first-week losses and strengthen your early chick health program? Call 1-800-533-5306 or email PoultryHelp@RalcoAgriculture.com to connect with our poultry team.
Avi-Lyte - When The Stress Is On
Avi-Lyte is a natural performance pack for poultry that hydrates and helps restore vital nutrients to ease transitions.
References:
WILLEMSEN H, DEBONNE M, SWENNEN Q, et al. Delay in feed access and spread of hatch: importance of early nutrition. World’s Poultry Science Journal. 2010;66(2):177-188. doi:10.1017/S0043933910000243
University of Tennessee Agricultural Extension Service. Nipple Watering Systems for Broilers. PB1533-2M-12/94 E12-2015-00-151-95.
Mississippi State University Extension. “Water-Related Factors in Broiler Production.” Mississippi State University Extension Service.
Harris, G. C., Nelson, G. S., Dodgen, W. H., & Seay, R. L. (1975). “Effects of Drinking Water Temperature on Broiler Performance.” Poultry Science, 54(3), 775–779.
Environmental Factors to Control When Brooding Chicks.” CAES Field Report, Bulletin 1287. University of Georgia College of Agricultural and Environmental Sciences.
Litter Quality and Broiler Performance. CAES Field Report, Bulletin 1267, University of Georgia Cooperative Extension.