Digestibility values are important for calculating of the ration nutritional quality. If we do not want to take these digestibility values from the tables, there are a number of methods applicable in agricultural laboratories, or, for their sophistication, only in research organizations. These are in vivo, in situ, in vitro, NIRs methods and digestibility prediction equations based on laboratory analyzes. Due to their unpretentiousness, they find their justification for the prediction equations of digestibility of feeds, which in their calculations are based on the values of common laboratory procedures.