How do commercial farms perform diagnostic serological monitoring (ELISA testing) to track antibody titers for ND, IB, and IBD during lay?

In large-scale brown layer operations, diagnostic serology is a vital early-warning tool to detect subclinical infections and track vaccine response. Farmers perform monthly monitoring using Enzyme-Linked Immunosorbent Assay (ELISA) testing. Collect blood samples from 20 to 30 randomly selected hens per shed, allow the blood to clot, spin the samples in a centrifuge to extract the serum, and submit them to a diagnostic laboratory. The ELISA test measures the precise concentration of circulating IgG antibodies against Newcastle Disease (ND), Infectious Bronchitis (IB), and Gumboro (IBD). By analyzing the Mean Titer and the Coefficient of Variation (CV%), veterinarians can verify if the flock has high, uniform immunity (CV% under 25%) or if a booster vaccine is required. Immunology is detailed in the Poultry Encyclopedia, laboratory centrifuges and diagnostic ELISA kits are sold on Poultry Plaza, live bird mandi rates are updated on Poultry Rates, and professional laying operations are listed on Murghi Mandi.