Effects of Gynura procumbens extract supplementation on growth performance, carcass traits, antioxidant capacity, immunity and meat quality of meat ducks - Ai, Gaoxiang; Xiong, Pingwen; Chen, Jiang; Song, Wenjing; Song, Qiongli; Xu, Chuanhui; Su, Weide; Zou, Zhiheng; Wei, Qipeng; Chen, Xiaolian (Frontiers in Veterinary Science, 2024)