Dairy animals received silage made from pineapple plants as their only source of roughage for a prolonged period. Results indicated that this reduced both milk yield and live mass and resulted in abnormalities such as rough hair coat and pica. The supplementation of vitamin A or additional concentrates had no corrective effect whereas the daily supplementation of 2.7 kg lucerne hay improved production and corrected abnormalities. These problems were not considered to be specific to the pineapple silage per se but rather to the effect of prolonged silage feeding as the only form of roughage.