Please pay attention to the symptoms of decreased egg production

As intensive farming models grow, the backdrop of antibiotic restrictions and reduced reliance on antibiotics has made poultry diseases increasingly complex. 

Immunosuppressive diseases like infectious bursal disease, swollen head syndrome, and viral arthritis have hit farmers hard, with reduced egg production in flocks often popping up in specific regions.

Of course, several diseases can cause egg production to drop, including Newcastle disease, avian influenza, infectious bronchitis, and rhinitis. Industry observations and data show egg drop syndrome has a higher detection rate in areas with dense layer and breeder chicken farms, clearly creating challenges for existing immunization programs.

Clinical Symptoms of Egg Drop Syndrome

1. Drop in Egg Production: Egg production falls suddenly and rapidly, lasting 4-10 weeks, with output potentially dropping by 40%-50%. Production may recover later, but the total loss is typically 10-16 eggs per hen.
2. Abnormal Eggs: Thin-shelled, soft-shelled, and shell-less eggs are common. Thin-shelled eggs are often rough or have a granular texture at one end; egg whites may become thinner, and eggs may occasionally be smaller.
3. Flock Health Status: The flock’s overall health shows no major issues, though reduced appetite and lethargy may occur. Infected flocks may have brief diarrhea.

Diagnosis of Egg Drop Syndrome

1. Clinical Diagnosis: When healthy hens show eggshell changes alongside a sudden drop in egg production, suspect EDSV infection. Carefully check eggshell changes—shell-less, soft-shelled, and thin-shelled eggs, beyond deformed eggs, are hallmarks of EDS.
2. Laboratory Diagnosis: Antibodies in unvaccinated flocks signal infection. However, in most cases, especially in offspring infected vertically via eggs, virus shedding and detectable H antibodies only show up when egg production hits 50%. This makes detecting carrier chickens with ELISA and PCR tough and often delayed, but it can confirm the diagnosis.

Treatment of Egg Drop Syndrome