1- DENNIS S.M., Urogenital defects in sheep, Vet. Rec., 1979, 13, 344-347

2- FRASER A.F., PENMAN J.H., A clinical study of ram infertilities in Scotland, Vet. Rec., 1971, 89, 154-158

3- LOSSON B., Les gales du mouton et de la chèvre, Point Vét., 2002, Numéro spécial 33, 130-134

4- RHODES A.P., Seminal degeneration associated with chorioptic mange of the scrotum of rams, Aust. Vet. J., 1975, 51, 428-32

5- SARGISON N., Differential diagnosis of sheep skin conditions Part 1: Ectoparasitic diseases, UK Vet., 2005, 10, 1-5