2 Material and methods
The seed cakes originated from the varieties ‘‘Lorenz’’
(rapeseed), ‘‘Lirina’’ (linseed) and ‘‘USO 31’’ (hemp).
The seeds were processed in a screw press (IBG Oekotec
Monforts GmbH&Co.KG) speed stage 2.5, 6 mm
nozzle, pressure head temperature 32–35 C.
A total of 216 laying hens (LB) were used in the
feeding study. The hens were allocated to nine
groups of 24 hens each. The hens were kept individually
in a cage battery. The study commenced when
the hens were 22 weeks old and continued until the
sixth laying month (168 days). Each hen was offered
the respective diet (Table 1) and water ad libitum. The
number of eggs laid was recorded daily and the individual
feed consumption was recorded monthly
per hen. Each month the collected eggs were weighed
four times within 2 weeks. All eggs laid over 3