Comparative analyses of semen and endocrine characteristics of free-living versus captive jaguars (Panthera onca) - Morato, R. G; Conforti, V. A; Azevedo, F. C; Jácomo, A. T. A; Silveira, L; Sana, D; Nunes, A. L. V; Guimarães, Marcelo Alcindo de Barros Vaz; Barnabé, Renato Campanarut (Reproduction, 2001)