Behavior infl uences water intake. For example, when pigs are housed
in metabolism crates, which are often required to study water balance in
detail, both hunger and boredom can lead to a polydipsia, which increases
water consumption 2- or 3-fold or more in some circumstances (Patience
et al., 1987; Fraser et al., 1990). A similar situation can arise in sows
housed in gestation stalls