1. Arey, D.S., Jamieson, W.G., 1997. Time course for the formation of a stable social hierarchy in group-housed sows. British Society of Animal Science Annual Meeting, p. 108.
2. Arey, D.S., Jamieson, W.G., 1998. Social recognition in group-housed sows after removal and re-grouping. Proceedings of the British Society of Animal Science, p. 39.
3. Britt, J.K., Day, B.N., Webel, S.K., Brauer, M.A., 1987. Induction of estrus in prepuberal gilts by treatment with a combination (PG600) of pregnant mare's serum gonadotropin and human chorionic gonadotropin. Technical Report No. 5. 18th Annual Meeting, American Association of Swine Practitioners, Indianapolis, IN.
4. Social rank and feeding behaviour of group housed sows fed competitively or ad libitum;Brouns;Appl. Anim. Behav. Sci.,1994
5. Measuring social behaviour: social dominance;Craig;J. Anim. Sci.,1986