“…It has been suggested by several researchers that tail-biting can be prevented Original Research by making changes in housing, changes in the animals' diet (mainly protein and mineral balance), and providing substrates (straw, compost, newspaper, ties), as well as eliminating atmospherically uncomfortable factors (high levels of ammonia, CO2, humidity, or low barometric pressure). 24,25,[27][28][29][30][31] Boredom is also a relevant factor in these circumstances. In rustic systems, where animal density is lower, sometimes rims, chains, or alfalfa branches are placed within enclosures as sources of entertainment for the animals, a situation which technified systems "cannot afford".…”