Ambrosia , Rachael, Robert Gilbert, Donald Bergfelt, Juan Samper, Erik Peterson, and Hilari French. “Sample Handling Has Minimal Effect on Blood Progesterone Concentrations in Jennies”. Clinical Theriogenology 12, no. 2 (1): 121-123. Accessed March 29, 2026. https://clinicaltheriogenology.net/index.php/CT/article/view/9207.