Roberts B.N., Gilbert R.O., Bergfelt D.R., Peterson E.W., Samper J.C., and French H.M. “The Early Conceptus and Circulating Blood Progesterone Concentrations in Caribbean Jennies ”. Clinical Theriogenology 10, no. 3 (September 1, 2018): 340. Accessed February 13, 2025. https://clinicaltheriogenology.net/index.php/CT/article/view/10045.