either integrated into the aviary rack itself (integrated nest; IN) or placed on the walls of the pens (wall nest; WN), resulting in a 2 × 2 factorial design Four thousand five hundred white laying hens were housed in 20 test pens.
eitherintegrated into the aviary rack itself (integratednest; IN) or placed on the walls of the pens (wall nest;WN), resulting in a 2 × 2 factorial design Four thousandfive hundred white laying hens were housed in 20test pens.