1. AHDB 2012. UK market survey. Retrieved on 31 August 2016 from http://www.thefarmsite.com/reports/contents/UKMarketSurvey1June2012.pdf.
2. A meta-analysis of the combined effect of housing and environmental enrichment characteristics on the behaviour and performance of pigs;Averós;Applied Animal Behaviour Science,2010
3. The Welfare Quality® project and beyond: safeguarding farm animal well-being;Blokhuis;Acta Agriculturae Scandinavica, Section A - Animal Science,2010
4. Welfare assessment in 82 pig farms: effect of animal age and floor type on behaviour and injuries in fattening pigs;Courboulay;Animal Welfare,2009
5. Experimental welfare assessment and on-farm application;Edwards;Animal Welfare,2007