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Histophilus somni (Haemophilus somnus) has been reported as the cause of epididymitis in rams. This bacterium has also been found in the preputial mucosa of rams without epididymitis lesions. H. somni is a bacterium that is difficult to characterize, since it is a pleomorphic Gram-negative bacilli of characteristics similar to Actinobacillus seminis, which is also found in ram epididymitis lesions. The objective of this work was to determine if H. somni (H. somnus) is involved in cases of sheep epididymitis. A clinical examination was performed in 160 rams, extracting semen by electro-ejaculation of 28 of them, which had epididymal lesions. The penis was exteriorized in order to avoid prepuce contamination. The semen samples were cultivated in chocolate agar in a 10% CO₂ environment. Two strains were isolated in pure culture with a colony morphology and microscopy similar to H. somni (H. somnus). These were …