{Project}     Legehennenhaltung: Optimierung der Auslaufnutzung.  [Poultry husbandry: Hen runs: Optimising structures on commercial farms.]   Runs 2000 - 2004.      Project Leader(s): Zeltner, Esther, Forschungsinstitut für biologischen Landbau (FiBL) .     

   Zeltner, Esther and Hirt, Helen   (2003) Effect of artificial structuring on the use of laying hen runs in a free-range system.   British Poultry Science, 44 (4), pp. 533-537.