Ultrasound has been used to diagnose uterine torsion in sheep. Ultrasound equipment is relatively expensive and may not be available for many practicing veterinarians, but one might have access to such equipment in veterinary colleges in the region. There are some published papers in this area.

Thank you very much Dr Britt, we have two machines of ultrasound with relatively good experience (pregnancy diagnosis, infertility cases in males and females). But we have no experience with the diagnosis of uterine torsion. What could we see in such cases?

Here are some references:

Scott. PR. Applications of diagnostic ultrasonography in small ruminant reproductive management. Animal Reproduction Science Volume 130, Issues 3–4, February 2012, Pages 184–186

A. Wehrend, H. Bostedt, E. Burkhardt. The use of trans-Abdominal B mode ultrasonography to diagnose intra-partum uterine torsion in the ewe. Vet. J., 176 (2002), pp. 69–70

P.R. Scott. Ovine caesarean operations: a study of 137 field cases. Br. Vet. J., 145 (1989), pp. 558–564

It is also possible to visualize the vaginal vault with aid of a vaginoscope and an external light. The torsion induces a misalignment of the vaginal folders (spiral-like trajectory) which may also be perceived by transvaginal palpation (helpful to have a small hand)

Thank you dr Rira, actually this is absolutely correct in cases of post-cervical position ( vaginal twisting after position of cervix). My question was for cases of pre-cervical torsion, in which the vaginal remains patent (no twisting or folds).  

Scott. PR. Applications of diagnostic ultrasonography in small ruminant reproductive management. Animal Reproduction Science Volume 130, Issues 3–4, February 2012, Pages 184–186

A. Wehrend, H. Bostedt, E. Burkhardt. The use of trans-Abdominal B mode ultrasonography to diagnose intra-partum uterine torsion in the ewe. Vet. J., 176 (2002), pp. 69–70

P.R. Scott. Ovine caesarean operations: a study of 137 field cases. Br. Vet. J., 145 (1989), pp. 558–564