Use of genital inspection and female urine tests to detect oestrus in captive asian elephants.

Thitaram, C.; Chansitthiwet, S.; Pongsopawijit, P.; Brown, J.L.; Wongkalasin, W.; Daram, P.; Roongsri, R.; Kalmapijit, A.; Mahasawangkul, S.; Colenbrander, B.; van der Weijden, G.C.; van Eerdenburg, F.J.C.M.