Vitamin D3 requirements and relative bioavailability for starter male White Pekin ducks fed either cholecalciferol or 25-hydroxycholecalciferol - Jing Tang; Lei Zhuang; Yating Li; Dawei Luo; Zhanbao Guo; Shuaiqin Wang; Jindang Cao; Mingkai Wang; Zhengkui Zhou; Ming Xie; Shuisheng Hou (Poultry Science, 2025)