Monorchidism in cattle (Bos taurus). Case report

Portal-Torres J.; Zambrano L.; Cueva-Rodríguez M. · Revista Cientifica de la Facultad de Veterinaria (2026) · DOI: 10.52973/rcfcv-e361788

Resumen

Monorchidism is a condition defined as the total absence of one of the testicles due to testicular agenesis. However, this absence may be associated with one of two causes: 1) This anomaly is usually related to the failure of the testicle to descend from the abdominal cavity, equivalent to cryptorchidism, but unilateral; 2) Testicular agenesis is known as anorchism, also described as Testicular Regression Syndrome, which can occur bilaterally or unilaterally. Both causes fall within what is known as Testicular Dysgenesis Syndrome. The objective of this study was to identify a pathology in a bovine animal. A case was reported of an 18-month-old Holstein bovine weighing 382 kg, with unknown parental history. Clinical inspection determined monorchidism, since only one testicle had developed and there was no failure to descend. The sample was transferred to the Veterinary Pathology Laboratory of the Faculty of Veterinary Sciences of the National University of Cajamarca. The presence of a single fully developed testicle with a scrotal circumference of 33 cm was observed. As a result of the macroscopic inspection, it was determined that the bovine had only one testicle. It was concluded that this was a case of monorchidism in cattle. © (2026), (Universidad del Zulia). All rights reserved.

Instituciones: Universidad Nacional de Cajamarca