Behavior influences 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