Bovine interleukin-25 (IL-25), also known as IL-17E, is a member of the IL-17 cytokine family and functions as a regulator of type 2 immune responses through interaction with the IL-17RA/IL-17RB receptor complex, activating downstream NF-κB and MAPK signaling pathways. In cattle, IL-25 is expected to promote Th2-associated cytokine production, including IL-4, IL-5, and IL-13, supporting eosinophil recruitment, mucosal immunity, and anti-helminth defense—processes that are particularly important in response to gastrointestinal nematodes and other parasitic infections common in livestock. In bovine health, IL-25 likely plays a role in balancing protective immunity and inflammation in conditions such as parasitic gastroenteritis, respiratory disease complex, mastitis-associated inflammatory responses, and allergic or hypersensitivity reactions. Dysregulated IL-25 signaling may contribute to excessive type 2 polarization, impacting productivity, growth, and overall herd health. Given the economic and agricultural importance of cattle, bovine IL-25 is relevant for understanding host–parasite interactions, improving vaccine strategies, and developing immunomodulatory approaches to enhance disease resistance, while also serving as a comparative model for studying type 2–driven inflammatory diseases across mammalian species.