Used in research settings to measure thyroxine (T4) hormone levels in duck serum or plasma samples. This ELISA kit enables scientists to assess thyroid function in poultry, supporting studies in avian endocrinology, metabolic health, and the impact of environmental or dietary factors on thyroid activity. It is particularly useful in agricultural research to monitor thyroid-related growth and development, as well as in toxicology studies evaluating endocrine disruption in birds. The assay provides a sensitive and specific quantitative analysis, making it suitable for high-throughput screening in laboratories focused on animal health and physiology.