Bäckström, L. 1973. Environment and animal health in piglet production. Ada Veterinaria Scandinavica 41: (suppl.) 1–240.
Baxter, M. R. and Schwaller, C. 1983. Space requirements for sows in confinement. In Farm animal housing and welfare (ed. Baxter, S. H., Baxter, M. R. and MacCormack, J. A. C.). Current topics in veterinary medicine and animal science, vol pp. 181–194. Martinus Nijhoff, The Hague.
Baxter, S. H. 1981. Welfare and the housing of the sow and suckling pigs. In The welfare of pigs (ed. Sybesma, W.). Current topics in veterinary medicine and animal science, vol. pp. 276–311. Martinus Nijhoff, The Hague.
Baxter, S. H. 1984. Intensive pig production: environmental management and design. Granada, London.
Blackshaw, J. K. and Hagelso, A. M. 1990. Getting-up and lying-down behaviours of loose-housed sows and social contacts between sows and piglets during day 1 and day 8 after parturition. Applied Animal Behaviour Science. 25: 61–70.
Brambell Committee. 1965. Report of technical committee enquire into the welfare of animals kept under intensive husbandry systems. Her Majesty's Stationery Office, London.
Cronin, G. M. and Cropley, J. A. 1991. The effect of piglet stimuli on the posture changing behaviour of recently farrowed sows. Applied Animal Behaviour Science. 30: 167–172.
Curtis, S. E., Hurst, R. J., Widowski, T., Shanks, R., Jensen, A., Gonyou, D., Bane, A., Muehling, A. and Kesler, R. 1989. Effects of sow-crate design on health and performance of sows and piglets. Journal ofAnimal Science. 67: 80–93.
Edwards, S. A. and Malkin, S. J. 1986. An analysis of piglet mortality with behavioural observations. Animal Production 42: 470 (abstr.).
Edwards, S. A., Smith, W. J., Fordyce, C. and MacMenemy, F. 1994. An analysis of the causes of piglet mortality in a breeding herd kept outdoors. Veterinary Record. 135: 324–327.
English, P. R. and Morrison, V. 1984. Causes and prevention of piglet mortality. Pig News and Information. 5: 369–376.
English, P. R. and Wilkinson, V. 1982. Management of the sow and litter in late pregnancy and lactation in relation to piglet survival and growth. In Control of pig production (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 479–506. Butterworths, London.
Hutson, G. D., Wilkinson, J. L. and Luxford, B. G. 1991. The response of lactating sows to tactile, visual and auditory stimuli associated with a model piglet. Applied Animal Behaviour Science. 32: 129–137.
Krohn, C. C. and Munksgaard, L. 1993. Behaviour of dairy cows kept in extensive (loose-housing/pasture) or intensive (tie stall) environments. II. Lying and lying-down behaviour. Applied Animal Behaviour Science. 37: 1–16.
Marchant, J. N. and Broom, D. M. 1996. Effects of dry sow housing conditions on muscle weight and bone strength. Animal Science 62: 105–113.
Marchant, J. N., Broom, D. M. and Corning, S. 1996. The effects of sow maternal behaviour on piglet mortality in an open farrowing system. Animal Science 62: 675 (abstr.).
Marchant, J. N. and Rudd, A. R. 1993. Differences in heart rate response at feeding between stall-housed and group-housed sows. Animal Production 56: 423 (abstr.).
Ministry of Agriculture, Fisheries and Food. 1990. Codes of recommendation for the welfare of livestock. Her Stationery Office, London.
Petherick, J. C. 1983. A biological basis for the design of space in livestock housing. In Farm animal housing and welfare (ed. Baxter, S. H., Baxter, M. R. and MacCormack, J. A. C.). Current topics in veterinary medicine and animal science, vol. 24, pp. 103–120. Martinus Nijhoff, Hague.
Schmid, H. and Hirt, H. 1993. Influence of domestication and housing conditions on the behaviour of lying down in sows. In Proceedings of the international congress on ethology (ed. Nichelmann, M., Wierenga, H. K. and Braun, S.), pp. 458–462. K.T.B.L., Darmstadt, Germany.
Taylor, L., Friend, T. and Smith, L. A. 1988. Effects of housing on in situ postures of gestating gilts. Applied Animal Behaviour Science. 19: 265–272.
Tillon, J. P. and Madec, F. 1984. Diseases affecting confined sows. Data from epidemiological observations. Annales de Recherches Veterinaires. 15: 195–199.
Whittemore, C. T. 1994. Causes and consequences of change in the mature size of the domestic pig. Outlook on Agriculture. 23: 55–59.