Keil, N.M., Wiederkehr, T., Wechsler, B., Friedli, K. (2004): Effect of outdoor exercise on the incidence of hock lesions in tied cows. In: Hänninen, L., Valros, A. (Ed.) Proceedings of the 38th International Congress of the ISAE, pp. 140. ISAE, Finland.
Wechsler, B., Keil, N., Wiederkehr, T., Friedli, K. (2004): Outdoor exercise reduces the incidence of hock lesions in dairy cows kept in tie stalls. In: Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production, Bled, Slovenia, 5 - 9 September 2004, Ed.: Wageningen Academic Publishers, Wageningen, Netherlands.
Keil, N.M., Wiederkehr, T.U., Friedli, K., Wechsler B. (2006):Effects of frequency and duration of outdoor exercise on the prevalence of hock lesions in tied Swiss dairy cows. Preventive Veterinary Medicine 74, 142-153.
Keil, N.M., Wiederkehr, T., Wechsler, B., Friedli, K. (2004): Effect of outdoor exercise on the incidence of hock lesions in tied cows. In: Hänninen, L., Valros, A. (Hrsg.) Proceedings of the 38th International Congress of the ISAE, pp. 140. ISAE, Finland.
Wechsler, B., Keil, N., Wiederkehr, T., Friedli, K. (2004): Outdoor exercise reduces the incidence of hock lesions in dairy cows kept in tie stalls. In: Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production, Bled, Slovenia, 5 - 9 September 2004, Hrsg.: Wageningen Academic Publishers, Wageningen, Netherlands.