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Pampa Rocha (PR) is a breed of pig that emerged in eastern Uruguay during the 18th century. They represent an important resource for non-intensive production using purebred or crossbred animals. However, productive activities have been oriented towards intensive production using commercial breeds, abandoning, except by some academic and educational institutions, the promotion of this creole breed. Thus, a population of few animals is still maintained, which could be in danger of disappearing. This work focuses on the fecal microbiota of these animals, which is related to the animal genetic background but also to their grazing capacity and resistance to weather. The structure and diversity of bacterial communities in the intestines of four PR adult females and of other breeds, including crosses, reared under non-grazing conditions, were analyzed and compared. Results obtained indicate that PR fecal microbiota is clearly different from those of other animals analyzed. Some sequences, corresponding to particular groups apparently related to the consumption of fiber, were strongly associated with PR pigs., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper, (© 2023 The Authors. Published by Elsevier Ltd.)