Three comparative feeding trials were conducted on cockerels of ROSS h
ybrid: The effect of two levels of rapeseed meal (RM) enriched with 1%
of lecithin slops (LS) and of enzymic concentrate ALLZYME VEGPRO (AVC
) was studied as exerted on broiler weight and feed consumption. The e
ffect of the higher RMLS level (a(2)) on broiler weight was positive a
nd significant (P 0.05) at 21 days of age (+ 6.45%). No statistically
significant differences between the experimental groups were determine
d at 35 and 42 days of age. The enzymic concentrate AVC did not have a
ny statistically significant effect on broiler weight in the separate
periods of observation. Feed consumption per 1 kg of weight gain was s
ignificantly (P < 0.05) higher in feed mixtures BR2 containing 12.12%
RMLS (a(2)) (+5.04%). Total feed consumption per 1 kg of weight gain w
as higher on average by 2.5% in groups (a(2) + a(3)) receiving feeds w
ith RMLS. The effect of enzymic concentrate AVC on total feed consumpt
ion per I kg of weight gain was not statistically significant. The sec
ond trial was focused on the effect of two RM levels and AVC on broile
r weight. The weight of broilers receiving feeds with different RM lev
els was comparable with the weight of broilers in control group (a(0))
The final broiler weight was not influenced by significant difference
s (P < 0.05) between the weight of broilers a(1) and a(2). The groups
of broilers on diets with enzymic concentrate AVC (b(1)) had insignifi
cantly higher weights (+2.13%) at the end of trial than did the broile
rs receiving feeds without any concentrate (b(0)). The effect of RM ap
plication to feed mixtures BR1 and BR2 at 6% (a(1)) and 12% (a(2)) lev
els on feed consumption per 1 kg of weight gain was highly significant
ly (P < 0.01) negative in comparison with control (a(0)). The enzymic
concentrate AVC did not influence the total average feed consumption p
er 1 kg of weight gain. The third trial was conducted to determine the
effect of experimental levels of lecithin slops and the effect of enz
ymic concentrate AVC on broiler weight. The effect of 1% LS applicatio
n to RM on broiler weight was positive in all experimental periods. Th
e broilers of group (a(2)) had significantly (P < 0.1) higher weight a
t 35 days of age than the broilers of group (a(0)). The cockerels of g
roup (a(2)) had by 5.04% higher weight at 42 days of age at the end of
trial than the individuals of group (a(0)). The cockerels which recei
ved diets with AVC concentrate showed by 3.02% higher average weight a
t 42 days of age than group (a(0)). Lecithin slops reduced feed consum
ption per 1 kg of weight gain significantly (P < 0.05) to highly signi
ficantly (P < 0.01). Slightly negative effects of LS use on feed consu
mption were determined in feed mixtures BR1 only. Total feed consumpti
on per 1 kg of weight gain was lowest in group (a(2)), which received
RM with LS at a 1% concentration. The application of enzymic concentra
te AVC resulted in a significant (P < 0.1) positive decrease in the co
nsumption of feed mixture BR2 per 1 kg of weight gain. There were no d
ifferences in total feed consumption per 1 kg of weight gain, and the
values were in the range of natural variability.