Morais, R. N. de; Mucciolo, R. G.; Viana, W. G. Reproductive Biology of Donkey. I. Testicular Measurement and Sexual Behaviour at Semen Collection. Braz. J. Vet. Res. Anim. Sci. 1993, 30 (1), 47-50. https://doi.org/10.11606/issn.1678-4456.bjvras.1993.52018.