The grazing animal also produce manure directly on the grassland and this direct supply has to be considered when the swine manure application rates are determined in order to avoid nutrients leaching. Since the swine manure did not present any problems for grass production, milk production and also cows’ behavior, swine manure could be used in place of commercial fertilizers to supplied nutrients for the most limiting element (nitrogen or phosphorus depending on the situation). The experiment has been done on two years and no difference in the health, weight and general status have been measured between the cows grazing on pasture where swine manure has been applied and the control group.