EFFECT OF EXOGENOUS ENZYMES IN HIGH FIBRE DIETS AND THEIR IMPACT ON BROILER PERFORMANCE
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Date
2009-10
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
Use of unconventional agro-industrial byproducts in poultry diets is restricted due to
high level of crude fibre or presence of some deleterious fixtors. The principal components of
dietary fibre are the structural carbohydrates which include cellulose, hemicellulose,
P-glucans, arabinoxylans and pectins. Inadequate or non-availability of certain enzymes in
the digestive tract of chicken reduces their nutrient utilization.
A feeding trial of 6 weeks duration was conducted on 240 day-old commercial male
broiler chicks procured and allotted randomly into eight treatments. Each treatment was
divided into six replicates, with five chicks per replicate and raised in electrically heated
battery brooders to evaluate tbe effect of exogenous enzymes on performance of broilers, fed
with high and low fibre diets. Eight test diets were prepared by supplementing enzyme
preparations to the reference diets i.e., TI, low fibre and T2 high fibre diets respectively. T3, T4
were low and high fibre diets supplemented with fibre degndng enzymes. Similarly, T5, T6
are low and high fibre diets supplemented with fibre degrading enzymes along with protease
enzyme. TI. T6 arc low and high fibre diets supplemented with protease enzyme. Feed and
water were provided ad libitum throughout the experimental period.
The performance of broilers in terms of weight gain, feed intake, feed efficiency,
livability, dressing percentage, visceral organs, abdominal fat, provenmculus weights and
small intestinal lengths along with immune response to NDV and SRBC were studied.
High fib diets (T4, T6, T6) supplemented with enzymes could record significantly
l;p-.OS) improved body weight gains during finisher (5-6 week) and overall periods (0-6
weeks) with respect to the'i control diet (T2).
Supplementation of protease enzyme to high fibre diet (Ts) resulted in significantly
(P4.05) improved body weight gain during starter, finisher and overall periods compared to
their correspoding control diet (G). The faad intake and feed-to-gain values were not
affected by supplementation of exogenous enzymes either to high or low fibre diets. The
livability was also unaffected on enzyme supplementation to both high and low fibre diets.
The moisture content of litter values also were not affected by enzyme supplementation.
Supplementation of enzymes to high and low fibre diets wuld recorded signific,antly
(P4.05) improved dressing percentage, while the organ weights like of proventriculus,
giblets, and abdominal fat and small intestine length were dected on enzyme
supplementation. The lymphoid organ weights (thymus, spleen and bursa) expressed as
percent on live body weight of bird were not affected on supplementation of enzymes either
to high or low fibre diets.
Humoral immune response to NDV in tenns of increased antibody production was
found to be significant (Pc0.05) at 42d age on enzyme supplementation to high fibre diets.
Antibody production on low fibre diets with enzyme supplementation was also not
influenced. Humoral immune response to sheep RBC, on the antibody production with
enzymes supplementation to either high or low fibre diets did not reveal any significant
(Ps0.05) effect. However, antibody production was significantly (Pa.05) different among
high or low fibre diets and enzyme supplemented diets.
Economic calculation revealed that the returns over feed cost on high fibre enzyme
supplemented diets were better over the unsupplemented diets and also low fibre enzyme
supplemented diets. Supplementation of fibre degrading enzymes (cellulase-420 IU / kg,
xylanasA025 IU / kg and pectinase-53 11J / kg) and proteolytic enzyme (protease-5000 U / kg)
to high fibre diets wuld result in better weight gains of broilers.
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