Morais, R. N. de, Mucciolo, R. G., & Viana, W. G. (1993). Reproductive biology of donkey. I. Testicular measurement and sexual behaviour at semen collection.
Brazilian Journal of Veterinary Research and Animal Science,
30(1), 47-50.
https://doi.org/10.11606/issn.1678-4456.bjvras.1993.52018