Urinary specific gravity as an alternative for the normalisation of endocrine metabolite concentrations in giant panda (Ailuropoda melanoleuca) reproductive monitoring. oleh Jella Wauters, Kirsten S Wilson, Tim Bouts, Iain Valentine, Koen Vanderschueren, Cyrillus Ververs, A Forbes Howie, Mick T Rae, Ann Van Soom, Rengui Li, Desheng Li, Hemin Zhang, Lynn Vanhaecke