Williams, E. J., Fischer, D. P., Pfeiffer, D. U., England, G. C. W., Noakes, D. E., Dobson, H., & Sheldon, I. M. Clinical evaluation of postpartum vaginal mucus reflects uterine bacterial infection and the immune response in cattle. THERIOGENOLOGY, 63(1), 102-117. https://doi.org/10.1016/j.theriogenology.2004.03.017