The swine industry weans piglets at a far earlier age than nature dictates. This can lead to behavioral problems such as belly nosing and belly sucking, ingesting solid feed at an older age, or drinking excessive amounts of water. Regardless of the quality of diet pigs have difficulty initiating solid feed intake when weaned at a young age. Belly nosing involves rooting at the udder of pen-mates and can persist even through to the finisher stage. Piglets that grow faster vs. slower will perform less belly nosing while weaning weight is not a determinant of future belly nosing. Piglet hunger does not seem to be a stimulant for belly nosing, but possibly stimulates nosing and rooting at the floors. Sensory cues are important for piglets (e.g. – sow auditory signal of milk let-down) and researchers have found that playing an audio feedback of a sow grunt can result in higher average daily gain for piglets weaned at 15 days. Administration of sow pheromones (which is an olfactory cue) in a nursery pen can result in more time at the feeder (done with 18 day weaning). Feeding piglets with a nipple-based feeder also appears to significantly reduce incidence of pen-mate directed nosing or sucking. However, nipple drinkers as opposed to trough drinkers tend to increase the incidence of belly nosing. Therefore, the early-weaned piglets tend to nurse on water nipples, thereby filling their guts and reducing feed intake.