3 Results
All three seed cakes are characterized by their high
content of protein (28–32 %), fiber (NDF 15–45 %, ADF
17–33 %) and lipid (11–16 %; Table 2). The hemp seed
cake had the highest content of NDF and ADF (45 and
32 %) und thus the content of metabolisable energy
(ME) of hemp seed cake was only 9.21 MJ/kg compared
to rapeseed cake with 12.08 MJ/kg and linseed cake
with 10.78 MJ/kg. In relation to the total fatty acids the
rapeseed oil contained the highest proportion of 60 %
oleic acid (C18:1 n-9). The linolenic acid (C18:3 n-3) in
linseed oil dominated with 51 % and the linoleic acid
(C18:2 n-6) in hemp seed oil with 56 %. The glucosinolates
of the rapeseed cake amounted to 21 mmol/
kg. The THC and cannabidiol content of hemp was
below the detection limit of 0.005 %.
There were significant effects of kind of cake and
of the dietary cake level tested on the determined
performance parameters (Table 3). A significant
lower performance was shown for feed intake, egg
mass production and feed-to-egg mass ratio at 15 %
dietary cake level compared with the 5 and 10 % cake
level groups. Also interaction was significant for all
these parameters, indicating that the cake level acted
differently for the three cakes: increasing the rapeseed
cake level the feed intake decreased whereas in