Used in immunological research to quantify secretory IgA levels in goat biological samples such as milk, colostrum, saliva, and mucosal secretions. Enables assessment of mucosal immune responses in goats, particularly in studies related to infectious diseases, vaccine efficacy, gut health, and neonatal immunity. Widely applied in veterinary research, dairy science, and animal health monitoring to evaluate immune status and passive transfer of immunity from mother to offspring. Supports development of health management strategies in goat farming and contributes to understanding of mucosal immunology in ruminants.