The shift to cage-free layer housing opened the door to poultry diseases that disappeared during the years of cage housing. At the Devenish Symposium held during the 2025 PEAK conference, Dan Wilson, DVM, Wilson Vet Co., discussed the return of several diseases from the past that affect today’s egg layers.
Layer hens in cage-free housing systems have freedom of movement, but they also encounter high levels of dust and airborne bacteria. Feed, litter, manure and bodily shedding all contribute to dust within the rooms, which challenges the hens’ health and well-being. Could spraying acidic electrolyte water on the litter floor be a solution?
By Kay Russo, DVM, MAHM, DACPV
RSM Consulting
Faced with the emerging disease threat posed by avian metapneumovirus (aMPV), the USDA is allowing the importation of three vaccines from Boehringer Ingelheim: the live virus products NEMOVAC™ for use in chickens and AVIFFA RTI for use in turkeys and chickens, as well as the TUR-3 inactivated vaccine for primary vaccination of both turkey and chicken flocks against aMPV subtype B.
Bird health and production are significantly impacted by air quality, humidity and temperature. Mechanical ventilation systems play a crucial role in maintaining indoor air quality and disease control, but the current systems have limitations, particularly in caged-layer facilities. Researchers from The Ohio State University have designed an innovative ventilation system that addresses health and heat concerns.
By Tanner Thornton, MS
Graduate Research Assistant, University of Tennessee
Knoxville, Tennessee
In the highly automated world of poultry production, precision livestock farming (PLF) technology to monitor birds in real time can be used to improve their health, welfare and efficiency. But there are limitations to this technology.
Low crude-protein diets are a well-proven practice to reduce diet cost and minimize excess nitrogen and excreta, thereby benefiting profitability, health and welfare in broilers and swine. However, the laying-hen industry is far behind in understanding the interaction and requirement of lower amino acids.
Calcium plays a key role in poultry feed conversion. In addition to bone density, muscle contraction and other critical functions, calcium affects the efficiency of turning food into weight gain. But in broilers, it’s not just the amount of calcium that matters. What really counts is bioavailability: how much of that nutrient the bird can actually use.
Maintaining indoor air quality is a constant concern for poultry producers. In particular, ammonia levels within houses are a health concern for poultry and workers. But what about the ammonia in exhausted air? Researchers from the University of Georgia are using a novel approach to remove and recover ammonia from large layer-poultry facilities.
Dust particles in poultry houses can exacerbate the spread of highly pathogenic avian influenza (HPAI), with the virus on dust particles remaining infectious for up to 17 hours. By the birds’ activity, it can easily be aerosolized into the environment and, by the ventilation system’s airflow, can be transmitted within the barn and from barn to barn.
By Alexander W. Strauch, DVM
Poultry Veterinarian
Four Star Veterinary Service, LLC
Minton Veterinary Service Office
Chickasaw, Ohio, USA
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