Social facilitation occurs when one animal increases performance of a behaviour due to the presence of another animal engaged in that same behaviour. Gonyou et al. (1992) reported that pigs in adjoining pens ate simultaneously more often if the feeders were adjacent to the common wall. Feeders which allow pigs to see pigs in the adjacent pen increase feed consumption in short trials (Hutson, 1995). Although these studies reported some form of social facilitation, the studies were either too short to detect an improvement in productivity, or none resulted. The objectives of this study were to determine if social facilitation of eating between pens of pigs can best be achieved by allowing visual contact through the wall or the feeder, and if feed consumption can be increased over an extended period of time.