Used in immunological research to quantify interleukin-4 (IL-4) levels in biological samples from sheep, such as serum, plasma, or cell culture supernatants. This kit is essential for studying Th2 immune responses, allergic reactions, and parasitic infections in ovine models. It supports vaccine development, disease monitoring, and evaluation of immune modulation in veterinary and agricultural research. The assay enables sensitive and specific detection of IL-4, allowing researchers to assess cytokine profiles and immune system activation in sheep.