A system to adjust a predetermined dosage of main livestock feed products in a predetermined feed recipe, which includes one or more feed dosages, each indicative of a predetermined amount of a corresponding main feed product in said feed recipe. The system includes a memory for storing the recipe, a meteorological monitoring system suitable for determining one or more meteorological parameters in the storage areas of the feed products and a processing unit, configured to: determine a first value indicative of the humidity in each feed product as a function of meteorological parameters associated with the related storage area, determine a differential value indicative of the difference between the first value and a second value indicative of a reference humidity of said feed product, and adjust the feed dosage associated with each feed product in the recipe based on the differential value of humidity in the main feed product.
