In factory farmg pregnant sows are confined to gestation crates and farrowing crates for all but a few weeks of their entire lives and suffer crowded conditions which are stressful, unsanitary, and compromise the animals’ immune systems. Part of the cruelty lies in the fact that animals are not given the opportunity to express behaviour typical of their species. The stressful conditions that prevail at intensive hog operations leads to increased levels of aggressive behaviour. The Winnipeg Humane Society's Quit Stalling campaign aims to ban sow stalls in Manitoba by 2013.
The centralization of hog processing means that hogs must endure long distance transportation that further stresses the animals. In many cases the animals have weak legs, weakened immune and cardiovascular systems and may suffer broken legs and illness, or even die, during long distance transport.