Urinary estrogens as a non-invasive biomarker of viable pregnancy in the giant panda (Ailuropoda melanoleuca)

Kirsten S Wilson, Jella Wauters, Iain Valentine, Alan McNeilly, Simon Girling, Rengui Li, Desheng Li, Hemin Zhang, Mick T. Rae, A. Forbes Howie, Ruth Andrew, William Colin Duncan