References

• Akos, K., Bilkei, G., 2004. Comparison of the reproductive performance of sows kept outdoors in Croatia with that of sows kept indoors. Livest. Prod. Sci. 85:293–298.
   Google Scholar
• Algers, B., 1984. Acoustic communication during suckling in the pig. Influence of continuous noise. pp 105–107 in: G. van Putten and K. Zeeb (eds.) Proc. Int. Congr. on Applied Ethology in Farm Animals, Kiel, Germany.
   Google Scholar
• Algers, B., 1994. Health, behaviour and welfare of outdoor pigs. Pig News Inf. 15:113N–115N.
   Google Scholar
• Algers, B., Ekesbo, I., Stromberg, S., 1978. Noise measurements in farm animal environments. Acta Vet. Scand. 68 (suppl.):1–19.
   Google Scholar
• Anil, L., Anil, S.S., Deen, J., Baidoo, S.K., Wheaton, J.E., 2005. Evaluation of well-being, productivity, and longevity of pregnant sows housed in groups in pens with an electronic sow feeder or separately in gestation stalls. Am. J. Vet. Res. 66: 1630–1638.
   Google Scholar
• Appleby, M.C., 1996. Can we extrapolate from intensive to extensive conditions? Appl. Anim. Behav. Sci. 49: 23–28.
   Google Scholar
• Berger, F., Dagorn, J., Le Denmat, M., Quillien, J.P, Vaudelet, J.C., Signoret, J.P., 1997. Perinatal losses in outdoor pig breeding. A survey of factors influencing piglet mortality. Ann. Zootech. 46:321–329.
   Google Scholar
• Berner, H., Dietel, M., 1992. Effect of noise on the course of farrowing. Tierarztliche Umschau 47:549–556.
   Google Scholar
• Bertacchini, F., 1997. Suini all’aperto. L’esperienza inglese e francese. Professione Allevatore 9:79–82.
   Google Scholar
• Bond, J., Winchester, C.F., Campbell, L.E., Webb, J.C., 1963. Effects of loud sounds on the physiology and behaviour of swine. US Dept. Agric., USDA-ARS Tech. Bull. N. 1280.
   Google Scholar
• Boyle, L.A., Leonard, F.C., Lynch, P.B., Brophy, P., 2000. Influence of housing system during gestation on behaviour and welfare of gilts in farrowing crates. Anim. Sci. 71:561–570.
   Google Scholar
• Bracke, M.B.M., Spruijt, B.M., Metz, J.H.M., Schouten, W.G.P., 2002a. Decision support system for overall welfare assessment in pregnant sows. A: model structure and weighting procedure. J. Anim. Sci. 80:1819–1834.
   Google Scholar
• Bracke, M.B.M., Spruijt, B.M., Metz, J.H.M., Schouten, W.G.P., 2002b. Decision support system for overall welfare assessment in pregnant sows. B: validation by experts opinion. J. Anim. Sci. 80:1835–1845.
   Google Scholar
• Bracke, M.B.M., Zonderland, J., Lenskens, P., Schouten, W.G.P.,Vermeer, H., Spoolder, H.A.M., Hendriks, H.J.M., Hopster, H., 2006. Formalised review of environmental enrichment for pigs in relation to political decision making. Appl. Anim. Behav. Sci. 98: 165–182.
   Google Scholar
• Brambell, F.W.R., 1965. Report of the Technical Committee to Enquire into the Welfare of Animals Kept under Intensive Livestock Husbandry Systems. Her Majesty’s Stationery Office, London, UK, Cmnd. 2836.
   Google Scholar
• Brouns, F., Edwards, S.A., 1994. Social rank and feeding behaviour of group-housed sows fed competitively or ad libitum. Appl. Anim. Behav. Sci.39: 225–235.
   Google Scholar
• Brouns, F., Edwards, S.A., English, P.R., 1994. Effects of dietary fibre and feeding system on activity and oral behaviour of group-housed gilts. Appl. Anim. Behav. Sci. 39:215–223.
   Google Scholar
• Bruininx, E.M.A.M., Heetkamp, M.J.W., Van den Bogaart, D., Van der Peet-Schwering, C.M.C., Beynen, A.C., Everts, H., Den Hartog, L.A., Schrama, J.W., 2002. A prolonged photoperiod improves feed intake and energy metabolism of weanling pigs. J. Anim. Sci. 80:1736–1745.
   Google Scholar
• Cagienard, A., Regula, G., Danuser, J., 2005. The impact of different housing systems on health and welfare of grower and finisher pigs in Switzerland. Prev. Vet. Med. 68:49–61.
   Google Scholar
• Carazzolo, A., Chiericato, G.M., Rongaudio, R., 1999. Preliminary observations on outdoor sow breeding. pp 567–569 in F. Angeli (ed.) Proc. 13th Nat. Congr. ASPA, Piacenza, Italy.
   Google Scholar
• Christison, G.I., 1996. Dim light does not reduce fighting or wounding of newly mixed pigs at weaning. Can. J. Anim. Sci. 76:141–143.
   Google Scholar
• Damm, B.I., Pedersen, L.J., Jessen, L.B., Thamsborg, S.M., Mejer, H., Ersbøll, A.K., 2003. The gradual weaning process in outdoor sows and piglets in relation to nematode infections. Appl. Anim. Behav. Sci. 82:101–120.
   Google Scholar
• Ekachat, K., Vajrabukka, C., 1994. Effect of music rhythm on growth performance of growing pigs. Kasetsart J. Nat. Sci. 28:640–643.
   Google Scholar
• Emilia Romagna (Italy) Regional Council, 2003. Resolution of 5 May 2003 concerning the rules for the application of the Council Regulation (EEC) No. 2092/91 and of the Council Regulation (EEC) No. 1804/99, exclusively for the parts concerning the methods of organic production and transformation of agricultural products in animal rearing. No. 2003/794. In: B.U. No. 98 of 09.07.2003.
   Google Scholar
• European Food Safety Authority, 2005. Opinion of the Scientific Panel on Animal Health and Welfare on a request from the Commission related to welfare of weaners and rearing pigs: effects of different space allowances and floor types. The EFSA Book 268: 1–19. In: http://www.efsa.europa.eu/en/science/ahaw/ahaw_opinions/1203.html
   Google Scholar
• European Food Safety Authority, 2007. Factors affecting pig welfare. pp 23–55 in: Scientific report on animal health and welfare in fattening pigs in relation to housing and husbandry. Annex to the EFSA Book, 564:1–14. In: http://www.efsa.europa.eu/EFSA/Scientific_Opinion/ahaw_report_pig_welfare_fattening_en,1.pdf
   Google Scholar
• Ewbank, R., Meese, G.B., 1974. Individual recognition and the dominance hierarchy in the domesticated pig. The role of sight. Anim. Behav. 22:473–480.
   Google Scholar
• Farm Animal Welfare Council, 1993. Second report on priorities for research and development in farm animal welfare. MAFF Publ., Tolworth, UK, PB 1310: 3–4.
   Google Scholar
• Farm Animal Welfare Council, 1996. Report on the welfare of pigs kept outdoors. Home page address: http://www.fawc.org.uk/reports/pigs/fawcptoc.htm
   Google Scholar
• Fraser, D., 1975. The effect of straw on the behaviour of sows in tether stalls. Anim. Prod. 21:59–68.
   Google Scholar
• Fraser, A.F., Broom, D.M., 1997. Farm animal behaviour and welfare. CABI Publishing, CAB International, Wallingford, UK.
   Google Scholar
• Friend, D.W., Cunningham, H.M., Nicholson, J.W.G., 1962. The duration of farrowing in relation to the reproductive performance of Yorkshire sows. Can. J. Comp. Med. Vet. Sci. 16:127–130.
   Google Scholar
• Guégen, R., Quillien, J.P., Meunier-Salaü´n, M.C., Salaü´n, C., Callarec, J., 2000. Incidence du système de logement et de la saison sur la survie néonatale des porcelets. Journ. Rech. Porcine en France, 32:123–128.
   Google Scholar
• Guy, J.H., Rowlinson, P., Chadwick, J.R., Ellis, M., 2002. Health conditions of two genotypes of growing-finishing pig in three different housing systems: implications for welfare. Livest. Prod. Sci. 75:233–243.
   Google Scholar
• Hansson, I., Hamilton, C., Ekman, T., Forslund, K., 2000. Carcass quality in certified organic production compared with conventional livestock production. J. Vet. Med. 47:111–120.
   Google Scholar
• Honeyman, M.S., 2005. Extensive bedded indoor and outdoor pig production systems in USA: current trends and effects on animal care and product quality. Livest. Prod. Sci. 94:15–24.
   Google Scholar
• Jarvis, S., Reed B.T., Lawrence, A.B., Calvert, S.K., Stevenson, J., 2004. Peri-natal environmental effects on maternal behaviour, pituitary and adrenal activation, and the progress of parturition in the primiparous sow. Anim. Welfare 13: 171–181.
   Google Scholar
• Jensen, P., Algers, B., 1982. An ethogram of piglet vocalizations during suckling. Appl. Anim. Ethol. 11:237–248.
   Google Scholar
• Kemper, A., 1976. Der verlauf der plasmakonzentrationen an katecholaminen und kortikosteroiden sowie des plasmabundenen jods (PBJ) bei schweinen unter einwirkung von geräuschen bei verschiedenen haltungsformen. Arch. Exp. Vet. Med. 30:309–315.
   Google Scholar
• Kemper, A., Wildenhahn, V., Lyhs, L., 1976. Die einwirkung lang anhaltender geräusche auf die plasmakonzentration an katecholaminen, glukokortikosteroiden und PBJ bei schweinen. Arch. Exp. Vet. Med. 30:619–625.
   Google Scholar
• Knierim, U., Hesse, D., Von Borrel, E., Herrmann, H.J., Muller, C., Rauch, H.W., Sachser, N., Zerbe, F., 2003. Voluntary animal welfare assessment of mass-produced farm animal housing equipment using a standardised procedure. Anim. Welfare 12:75–84.
   Google Scholar
• Kouba, M., 2003. Quality of organic animal products. Livest. Prod. Sci. 80:33–40.
   Google Scholar
• Le Denmat, M., Dagorn, A., Aumaître, A., Vaudelet, J.C., 1995. Outdoor pig breeding in France. Pig News Inf. 16:13N-16N.
   Google Scholar
• Li, Y.Z., Chénard, L., Lemay, S.P., Gonyou, H.W. 2005. Water intake and wastage at nipple drinkers by growing finishing pigs. J. Anim. Sci. 83: 1413–1422.
   Google Scholar
• Lippmann, J., Schaffer, D., Laube, R.B., 1999. Noise at slaughter plants – Behavioural adaptation of slaughter pigs to different noise situations. KTBL Schrift 382: 181–188.
   Google Scholar
• Main, D.C., Webster, A.J.F., Green, L.E., 2001. Animal Welfare Assessment in farm assurance schemes. Acta Agr. Scand. 51(suppl.30): 108–113.
   Google Scholar
• Martelli, G., 2002. Intossicazioni alimentari del suino da composti inorganici ed organici. pp 67–85 in: Proc. 28th Ann. Meet. SIPAS, Round table on Feed poisoning of pigs, Piacenza, Italy.
   Google Scholar
• Martelli, G., Scipioni, R., Parisini, P., Badiani, A., Sardi, L., 2003. The effects of two floor space allowances on meat quality and behaviour of heavy pigs. Proc. 54th Ann. Meet. EAAP, Roma, Italy, Wageningen Pers, Book of Abstracts no. 9: 178 (Poster CMNSI.27).
   Google Scholar
• Martelli, G., Scipioni, R., Scalabrin, M., Sardi, L., 2005. Effects of the length of the artificial photoperiod on growing parameters and behaviour of heavy pigs. Vet. Res. Comm. 29:367–369.
   Google Scholar
• Mattiello, S., Heinzl, E., Abruzzese, C., Carenzi, C., 2004. Effetto dell’intensità di illuminazione sul benessere del suino pesante in due differenti sistemi stabulativi. Riv. Suinicolt. 45(10):143–149.
   Google Scholar
• McGlone, J.J., Nicholson, R.I., Hellman, J.M., Herzog, D.N., 1993. The development of pain in young pigs associated with castration and attempts to prevent castration-induced behavioural changes. J. Anim. Sci. 71:1441–1446.
   Google Scholar
• Meese, G.B., Conner, D.J., Baldwin, B.A., 1975. Ability of the pig to distinguish between conspecific urine samples using olfaction. Physiol. Behav. 15:121–125.
   Google Scholar
• Millet, S., Moons, C.P.H., Van Oeckel, M.J., Janssens, G.P.J., 2005. Welfare, performance and meat quality of fattening pigs in alternative housing and management systems: a review. J. Sci. Food Agric. 85:709–719.
   Google Scholar
• Mortensen, B., Ruby, V., Pedersen, B.K., Smidth, J., Larsen, V.A., 1994. Outdoor pig production in Denmark. Pig News Inf. 15:117N-120N.
   Google Scholar
• Murata, H., Shimada, N., Yoshioka, M., 2004. Current research on acute phase protein in veterinary diagnosis: an overview. Vet. J. 168:28–40.
   Google Scholar
• Nansen, P., Roepstorff, A., 1999. Parasitic helmints of the pig: factors influencing transmission and infection levels. Int. J. Parasitol. 29:877–891.
   Google Scholar
• OIE - World Organisation for Animal Health, 2005. Terrestrial Animal Health Code 2005. Appendix 3.7.1. Introduction to guidelines for animal welfare. Home page address: http://www.oie.int/
   Google Scholar
• Otten, W., Kanitz, E., Puppe, B., Tuchsherer M., Brüssow, K.P., Nürnberg, G., Stabenow, B., 2004. Acute and long term effects of chronic intermittent noise stress on hypothalamic-pituitary-adrenocortical and sympatho-adrenomedullary axis in pigs. Anim. Sci. 78:271–283.
   Google Scholar
• Owen, G., 1992. Dangerous bacon. Occup. Health Rev. 38: 32 (abstr.).
   Google Scholar
• Petersen, H.H., Dideriksen, D., Christiansen, B.M., Nielsen, J.P., 2002. Serum haptoglobin concentration as a marker of clinical signs in finishing pigs. Vet. Rec. 151:85–89.
   Google Scholar
• Petherick, J.C., Bodero, D.A., Blackshaw, J.K., 1987. The use of partial barriers along the feed trough in a group housing system for non-lactating sows. Farm Build. Eng. 4:32–36.
   Google Scholar
• Potkins, Z.V., Lawrence, T.L.J., Thomlinson, J.R., 1989. Oesophagogastric parakeratosis in the growing pig: effect of the physical form of barley-based diets and added fibre. Res. Vet. Sci. 47:60–67.
   Google Scholar
• Regula, G., Danuser, J., Spycher, B., Wechsler, B., 2004. Health and welfare of dairy cows in different husbandry systems in Switzerland. Prev. Vet. Med. 66:247–264.
   Google Scholar
• Robert, S., Matte, J.J., Farmer, C., Givand, C.L., Martineau, G.P., 1993. High-fibre diets for sows: effects on stereotypes and adjunctive drinking. Appl. Anim. Behav. Sci. 37:297–309.
   Google Scholar
• Robert, S., Rushen, J., Farmer, C., 1997. Both energy content and bulk of food affect stereotypic behaviour, heart rate and feeding motivation of female pigs. Appl. Anim. Behav. Sci. 54:161–171.
   Google Scholar
• Scipioni, R., 2005. Stressor ambientali e benessere animale. In: L. Alborali and M. De Cillà (eds.) Proc. 28th Course on Swine Pathology and Production. Fondaz. Iniziative Zooprof. Zoot. Publ., Brescia, Italy, 60:25–41.
   Google Scholar
• Scipioni, R., Martelli, G., Paganelli, R., Sardi, L., 2005. The behaviour of the lactating sow as affected by two different feeding techniques. Vet. Res. Comm. 29: 383–385.
   Google Scholar
• Scipioni, R., Martelli, G., Sardi, L., Parisini, P., 2001. Behaviour of lactating sows and litters in relation to the feeding system of the sows. pp 323–325 in Proc. 14th Nat. Congr. ASPA, Firenze, Italy.
   Google Scholar
• Scott, K., Chennels, D.J., Campbell, F.M., Hunt, B., Armstrong, D., Taylor, L., Gill, B.P., Edwards, S.A., 2006. The welfare of finishing pigs in two contrasting housing systems: fully slatted versus straw-bedded accommodation. Livest. Sci. 103: 104–115.
   Google Scholar
• Slevin, J., Wiseman, J., Parry, M., Walker, R.M., 2001. Effect of protein nutrition on bone strength and incidence of osteochondrosis. Page 11 in Proc. Ann. Meet. Brit. Soc. Anim. Sci., York, UK.
   Google Scholar
• Smith, B., Morgan, M., 1997. The role played by the floor surface in the development of claw lesions in the pig. Project report, SAC Veterinary Science Division. Scottish Agricultural College ed., Aberdeen, UK.
   Google Scholar
• Sørensen, M.T., Jensen, B.B., Poulsen, I.D., 1994. Nitrate and pig manure in drinking water to early weaned piglets and growing pigs. Livest. Prod. Sci. 39: 223–227.
   Google Scholar
• Spensley, J.C., Lines, J.A., Hartung, J., Waran, N.K., 1994. The effect of noise on individual piglets. Appl. Anim. Behav. Sci. 41:278 (abstr.).
   Google Scholar
• Spoolder, H.A.M., Burbidge, J.A., Edwards, S.A., Simmins, P.H., Lawrence, A.B., 1995. Provision of straw as a foraging substrate reduces the development of excessive chain and bar manipulation in food restricted sows. Appl. Anim. Behav. Sci. 43:249–262.
   Google Scholar
• Stull, C.L., Kachulis, C.J., Farley, J.L., Koening, G.J., 1999. The effect of age and teat order on alpha1-glycoprotein, neutrophil-to-lymphocyte ratio, cortisol, and average daily gain in commercial growing pigs. J. Anim. Sci. 77:70–74.
   Google Scholar
• Talling, J.C., Lines, J.A., Wathes, C.M., Waran, N.K., 1998. The acoustic environment of the domestic pig. J. Agr. Eng. Res. 71: 1–12.
   Google Scholar
• Taylor, N., Prescott, N., Perry, G., Potter, M., Le Sueur, C., Wathes, C., 2006. Preference of growing pigs for illuminance. Appl. Anim. Behav. Sci. 96:19–31.
   Google Scholar
• Thomas, C., Signoret, J.P., 1989. Apprentissage de l’utilisation d’un système de libre service alimentaire par un groupe de truies gestantes: rôle des facteurs individuels et sociaux. Journ. Rech. Porcine en France 21: 297–300.
   Google Scholar
• Turner, S.P., Dahlgren, M., Arey, D.S., Edwards, S.A., 2002. Effect of social group size and initial live weight on feeder space requirement of growing given food ad libitum. Anim. Sci. 75: 75–83.
   Google Scholar
• Turner, S.P., Sinclair, A.G., Edwards, S.A., 2000. The interaction of liveweight and the degree of competition on drinking behaviour in growing pigs at different group sizes. Appl. Anim. Behav. Sci. 67: 321–334.
   Google Scholar
• Tuyttens, F.A.M., 2005. The importance of straw for pigs and cattle welfare. Appl. Anim. Behav. Sci. 92: 261–282.
   Google Scholar
• Van de Weerd, H.A., Docking, C.M., Day, J.E.L., Breuer, K., Edwards, S.A. 2003. Effects of species-relevant environmental enrichment on the behaviour and productivity of finishing pigs. Appl. Anim. Behav. Sci. 99: 230–247.
   Google Scholar
• Volpelli, L.A., 2001. Esperienze di allevamento di scrofe all’aperto. pp 147–161 (vol. I) in Proc. 26th Int. Symp. of Animal Production, Portonovo (AN), Italy.
   Google Scholar
• Waller, C.M., Bilkei, G., 2002. Effect of mating frequency on sow reproductive performance under field conditions and natural mating in large outdoor production units. Reprod. Dom. Anim. 37:116–118.
   Google Scholar
• YongJun, K., MoonHee, J., JeongGon, C., Myoung-Soon, K., 1999. Investigation of the causes of abortion and infertility in the swine after consecutive detonation into base rock and use of heavy equipment. Korean J. Vet. Clin. Med. 16:381–388.
   Google Scholar