The biotransformations of cholic acid (1a), deoxycholic acid (1b) and hyodeoxycholic acid (1c) to bendigoles and other metabolites with bacteria isolated from the rural slaughterhouse of Cayambe (Pichincha Province, Ecuador) are reported. The more active strains have been characterized and belong to the genus Pseudomonas and Rhodococcus. Various biotransformation products have been obtained depending on bacteria and substrates. Cholic acid (1a) afforded the 3-oxo and 3-oxo-4-ene derivatives 2a and 3a (45 and 45%, respectively) with P. mendocina ECS10, 3,12-dioxo-4-ene derivative 4a (60%) with Rh. erythropolis ECS25 and 9,10-secosteroid 6 (15%) with Rh. erythropolis ECS12. Bendigole F (5a) was obtained in 20% with P. fragi ECS22. Deoxycholic acid (1b) gave 3-oxo derivative 2b with P. prosekii ECS1 and Rh. erythropolis ECS25 (20 and 61%, respectively) while 3-oxo-4-ene derivative 3b was obtained with P. prosekii ECS1 and P. mendocina ECS10 (22 and 95%, respectively). P. fragi ECS9, moreover, afforded bendigole A (8b; 80%). Finally, P. mendocina ECS10 biotransformed hyodeoxycholic acid (1c) to 3-oxo derivative 2c (50%) and Rh. erythropolis ESC12 to 6α-hydroxy-3-oxo-23,24-dinor-5β-cholan-22-oic acid (9c, 66%). Bendigole G (5c; 13%) with P. prosekii ECS1 and bendigole H (8c) with P. prosekii ECS1 and Rh. erythropolis ESC12 (20 and 16%, respectively) were obtained. This article is protected by copyright. All rights reserved.