As noted in the most recent Miner Institute’s Farm Report, researchers from Agriculture and Agri-Food Canada and the University of British Columbia compared the behavior of calves diagnosed with either a respiratory or gastro-intestinal disease to matched (same age and feeding protocol) healthy calves when fed high (12 liters) or low (4 to 6 liters) amounts of milk or milk replacer. The amount of milk offered did not affect the likelihood of a calf developing an illness, but there were significant differences in the behavioral response. Calves offered 12 liters/day decreased their intake by roughly 2.5 liters/day, feeding time, and number of visits to the feeding compared to the healthy calves. Conversely, the calves offered 4 to 6 liters/day only decreased the time spent at the feeder. These data suggest the ability to detect illness in calves fed from automated feeders may be dependent on the amount of milk being offered. This research was presented at the Congress of International Society of Applied Ethology.