Fig. 3

Expression of the vitamin D receptor (VDR), calcium binding protein D_9k (Calbindin-D _9k ) and plasma membrane Ca²⁺-ATPase 1b (PMCA1b) genes in goat mammary epithelial cells in response to different 1,25-(OH)₂D₃ concentrations. Different letters within a single figure represent a significant difference (P < 0.05)