1. Bachmann, I., Stauffacher, M., 1998. Tierschutzrelevante probleme bei der haltung und nutzung von Pferden: eine erhebung zum status quo in der schweiz. Aktuelle Arbeiten zur artgemassen Tierhaltung 1997. KTBL-Schrift 380, KTBL, Darmstadt, pp. 80–90.
2. Bell, R.A., Nielsen, B.D., Waite, K., Heleski, C., Rosenstein, D., Orth, M., 2002. Influence of housing on the third metacarpus and markers of bone and cartilage metabolism in Quarter Horse weanlings. J. Equine Vet. Sci., in press.
3. Broom, D.M., Johnson, K.G., 1993. Stress and Animal Welfare. Chapman & Hall, London.
4. Budiansky, S., 1997. The Nature of Horses. The Free Press, New York.
5. The identification of abnormal behaviour and behavioural problems in stabled horses and their relationship to horse welfare: a comparative review;Cooper;Equine Vet. J. Suppl.,1998