EFFECTS OF ENZYME SUPPLEMENTATION ON THE UTILIZATION OF FIBROUS FEED INGREDIENTS IN BROILER DIETS
EFFECTS OF ENZYME SUPPLEMENTATION ON THE UTILIZATION OF FIBROUS FEED INGREDIENTS IN BROILER DIETS
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Date
2006-05
Authors
NDUAKA, UCHECHUKWU KINGSLEY
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Abstract
Effects of two enzymes, (Nutrase Xyla and Maxigrain) on the
utilization of two fibrous feed ingredients, (Rice and Maize Offals) were
studied in two broiler feeding experiments.
For experiment one, there were eight dietary treatments for both the
starter and finisher phases. Diet 1 was the control (0% rice offal, no
enzyme), while diet 2 was made up of 0% rice offal diet plus maxigrain
enzyme. Diets 3 to 8 were made up of the 7.5% and 15% dietary levels of
rice offal with each dietary level supplemented with either zero enzyme or
xylanase or maxigrain enzymes respectively. Enzymes were supplemented
at the rate of 100g/ton of diet. Results for the starter phase (0-4weeks)
showed that both enzymes when supplemented in the 7.5% and 15% rice
offal diets, improved the performance of broiler chicks for final weight and
weight gain over the unsupplemented rice offal diets. Broiler chicks,
however, could not effectively utilize rice offal at both 7.5% and 15% in
the diets even when supplemented with either of the two enzymes
especially when compared with the results for the control diet. At the
finisher phase (5-9weeks), the results showed that both enzymes
significantly improved (p<0.05) broiler performance at 7.5% and 15% rice
offal dietary inclusion levels above the performances of the birds on the
unsupplemented rice offal diets and of those on the control diet for final
weight, weight gain and average daily gain.
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Experiment two was also conducted using maize offal which was
fed at 0 and 25% dietary levels. For each dietary level of maize offal, three
enzyme sources were tested namely; zero enzyme, xylanase and maxigrain
enzymes. Enzyme supplementations were also made at the manufacturers’
recommended level of 100g/ton of diet for both enzymes. The broiler
starter phase lasted from zero to 4weeks while the finisher phase lasted
from 5 to 9 weeks. Results showed that both enzymes had no significant
effect when supplemented in the control diet but they both significantly
improved the performance of broilers on the 25% maize offal diet for final
weight, weight gain, average daily gain and feed-to-gain ratio up to the
levels obtained with the control diet. There were significant reductions in
feed cost (N/kg gain) in both experiments by enzyme supplementation.
Carcass analysis showed tendency for enzyme supplementation to
reduce the size of the liver. Percent Breast also increased slightly due to
enzyme supplementation of the finisher diets.
It was concluded that enzyme supplementation did not improve the
utilization of energy rich diets but improved utilization of maize offal
based diets at the broiler starter and finisher phases and of the diets
containing up to 15% rice offal especially at the finisher phase. It was also
concluded that broiler chicks cannot effectively utilize rice offal in their
diet during the starter phase whether or not the diet is supplemented with
enzymes.
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TABLE OF CONTENT
Description
A THESIS SUBMITTED TO POSTGRADUATE SCHOOL AHMADU
BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE
REQUIREMENT FOR THE AWARD OF MASTERS OF SCIENCE IN
ANIMAL SCIENCE
ANIMAL SCIENCE DEPARTMENT
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY, ZARIA.
MAY, 2006
Keywords
EFFECTS,, ENZYME SUPPLEMENTATION, UTILIZATION,, FIBROUS FEED ,, INGREDIENTS ,, BROILER DIETS.