Abstract: The present invention relates to the use of natural active compounds selected from the group consisting of guajacol, turmeric, 3-methylphenol, eugenol, eucalyptol, L-menthol and thymol in the manufacture of a diet for animals of the genus equidae, preferably horses. More particular, this invention relates to the use of at least two, preferably at least three compounds as defined above for the improvement of the digestibility of the diet, an improved intestinal stability, a better feed intake and a better welfare and for stabilizing or modulating the gut micro flora of the animal.