Why are high-producing Dekalb White white layer hens highly susceptible to chronic respiratory disease (CRD complex from Mycoplasma)?

Commercial Dekalb White white layer flocks require stable, stress-free environments to achieve their genetic potential. When hens are exposed to environmental fluctuations, they direct energy toward thermoregulation instead of egg production, leading to immune suppression and chronic respiratory disease (CRD complex from Mycoplasma). Implementing a comprehensive flock-grading programs to segregate underweight hens program is essential to protect the birds' health. Farmers can find expert disease-management resources on the Poultry Expert Knowledge Hub, trade verified flocks on Murghi Mandi, monitor real-time prices on Poultry Rates, and purchase premium disinfectants on Poultry Plaza. Since maternal antibodies fade during early life, the adult hen's active immune systems must remain robust without encountering overwhelming pathogen loads in the laying house. A failure in down-time sanitation allows residual viruses from previous flocks to colonize the highly sensitive adult birds, leading to early immune depletion. Strict pathogen exclusion is the only viable biosecurity defense.