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Effect of cellulase-glucanase-xylanase
combination on the nutritive value of Telfairia
occidentalis leaf meal in broiler diets
A. O. Fasuyi*
and O. A.
Kehinde
Department of Animal Production and Health Sciences,
University of Ado-Ekiti, Ekiti State, Nigeria.
*Corresponding author. E-mail:
dejifasuyi@yahoo.com.
Accepted
10 September, 2009 |
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Telfairia occidentalis
leaves were
purchased fresh from local farmers, sun dried and milled
into T. occidentalis leaf meal (TOLM). The proximate
analyses revealed that TOLM contained 35.14 ± 0.44% crude
protein; 9.61 ± 0.01% fat; 12.68 ± 0.02% crude fibre; 10.87
± 0.02% ash; 9.04 ± 0.13% dry matter and 3.25 ± 0.01 kcal/ g
gross energy. Eight broiler starter diets were formulated to
be isocaloric and isonitrogenous. Diet 1 was duplicated such
that the enzyme combination of cellulase, glucanase and
xylanase (Roxazyme G2) was incorporated into one while
Roxazyme G2 was lacking in the other (control diets 1a & 1b,
with and without enzyme supplementation). Diets 2 and 3 were
duplicate diets at 10% TOLM inclusion levels with the only
difference being the Roxazyme G2 supplementation in diet 3.
Diets 4 and 5 were also duplicates at 20% TOLM inclusion
level with Roxazyme G2 supplementation in diet 5. Diets 6
and 7 at 30% TOLM inclusion were also in duplicate with diet
7 having Roxazyme G2 supplementation. The weight gain (WG)
value for chickens on diet 1b with enzyme supplementation
was highest at 19.51 ± 2.10g/chick although similar (P >
0.05) to WG values for birds on diets 1a (without enzyme
supplementation), 2 and 3 while diet 7 with 30% TOLM
inclusion with Roxazyme G2 supplementation had the lowest WG
of 11.09 ± 0.39g/chick. Feed consumption (FC) was similar
and higher in birds on diets 1a & b, 2 and 3. FC was also
similar and lower in birds on diets 4, 5, 6 and 7. Feed
conversion ratios did not differ significantly among the
experimental diets except Diet 7. The operative protein
efficiency ratio (PER) was higher and similar (P > 0.05) for
birds on diets 1a & b, 2 and 3 on one hand and lower and
similar (P>0.05) for birds on diets 4, 5, 6 and 7 on the
other hand. The nitrogen retention (NR) value was highest
for diet 1b (with enzyme supplementation) at 72.37 ± 0.10
but similar (P > 0.05) to birds on diets 1a, 4 and 5. There
were no significant differences (P > 0.05) among means of
the heamatological parameters tested. The mortality during
the experimental period was insignificant and less than 1%
of the total number of birds used.
Key words:
Enzyme supplementation, leaf meal, Roxazyme G2, chicks,
poultry feed |
