Subacute ruminal acidosis (SARA) is a very common disease occurring in herds of high producing dairy cows. An early detection, treatment and especially prevention of SARA are very important to reduce losses in performance and, above all, protéct the health of animals. The experiment presented in this páper aimed to assess the possibility of predicting ruminal milieu parameters from basic analyzes of feces, and thus facilitate the disease detection. Ruminal pH was measured continuously by indwelling sensors. Feces were collected once a day and analyzed for pH, dry matter and starch content. We did any significant correlations between the ruminal and fecal parameters measured that can be ušed to predict and prevent SARA. However, the use of rumen pH boluses alone is an excellent means of monitoring the rumen health, and it cannot be replaced by fecal analyzes.