References
- FAO database: www.fao.org.
- WINDHORST, H.-W. (2001) Enriched layer cages and open markets for agricultural products – is there a chance for the European egg industry? Zootecnica 23 (8): 21–34.
- WINDHORST, H.-W. (2004) Will Germany actually ban cages in 2004? Zootecnica 26(4): 18–29.
- WINDHORST, H.-W. (2005) Changing regional patterns of turkey production and turkey meat trade. In: Turkey production: prospects on future developments (Hafez, H., Ed.). Berlin, Germany: Mensch und Buch Verlag, pp. 25–41.
- WOLFFRAM, R., SIMONS, J., GIEBEL, A. and R. BONGAERTS, (2002) Impacts of stricter legal standards in the EU for keeping laying hens in battery cages. World's Poultry Science Journal 58: 365–370.