EFFECT OF ENCAPSULATION OF FEED ENZYMES ON PERFORMANCE OF BROILERS
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Date
2011-09
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
The effect of feeding encapsulated enzymes in corn soya pelleted diets on the
performance of broilers was studied. The enzyme supplementations like phytase,
xylanase and cocktail (cellulase, xylanase, pectinase, mannanase, glucanase, amylase,
and protease) available in market were procured, encapsulatecUcoated with sodium
alginate and included to corn-soya diet at recommended doses. The feed was then
pelleted at 80°C in a steam conditioner of 0.6 MPa for 10 s. The enzyme combinations
were offered to nine groups, each consist of 30 male broiler chicks (Vencobb) from day
old to 6 weeks of age. The chicks were raised on wire floor electrically heated battery
brooders; feed and water were provided ad libitum. The performance of broilers in
terms of body weight gain, feed consumption, feed efficiency, livability, dressing yield,
relative length of small intestine in centimeters, proventriculus weight, abdominal fat
weight and relative weights of giblets. Lymphoid organs such as thymus, bursa and
spleen weights, which were expressed as percentage of live body weight, were also
In the present study broilers showed significantly (P(0.05) increased body
weight gains on supplementation of uncda nd coated ~eto corsn-soya diet
during finisher phase (4-6 weeks) and overall period (0-6 weeks) than the control diet.
Coated enzyme supplemented diets yielded significantly (P<0.05) increased body
weight gains over their respective uncoated supplemented diets during starter phase (0-
3 weeks) , finisher phase(4-6 weeks) and overall period (0-6 weeks) except in coated
phytase supplemented diet which only resulted in significantly (P<0.05) increased body
weight gain over uncoated phytase supplen~ented diet (T2) during finisher phase (4-6
weeks).
Feed intake of broilers on supplementation of uncoated and coated enzymes to
corn- soya diet showed no significant difference during 1-6 week of age when compared
to control diet. Supplementation of uncoated and coated enzymes in pelletized corn soya
diet yielded significantly (Pc0.05) efficient feed to weight gain values over the control
diet during finisher phase (4-6 weeks) and overall period (0-6 weeks). Coated enzyme
supplemented diets yielded significantly (Pc0.05) efficient feed to weight gain values
over their respective uncoated enzyme supplemented diets during finisher phase (4-6
weeks) and overall period (0-6 weeks).
Supplementation of uncoated or coated enzyme preparations to corn soya diet did
not influence the livability, dressing percent, abdominal fat weight, proventriculus
weight, visceral organ weights (liver, lleart, and gizzard), intestinal lengths (cm) and
weights of immune organs (thymus, bursa and spleen) in broilers.
In vitro feed analysis of release of total sugars (mg/gm diet) from uncoated and
coated enzymes supplemented pelletized corn soya diets yielded higher values of total
sugars (mglgm feed) in enzyme treated diets than control diet in both starter and
finisher feed. Coated enzyme supplemented diets yielded higher values of total sugars
(mg/grn feed) over their respective uncoated enzyme supplemented diets in both starter
and finisher feed. In viho fced analysis of release of inorganic phosphorous (g/kg diet)
from phytase enzyme supplemented corn-soya pelleted diets yielded higher values of
inorganic phosphorous release in ooated phytase supplemented diets than uncoated
phytase supplemented diets. However, both uncoated and coated phytase enzyme
supplemented diets yielded higher inorganic phosphorous values than control diet.
The returns over feed cost of Rs 48.31 to 50.94 per bird on uncoated enzyme
supplemented diets as against Rs 44.05 on control diet. The return over feed cost was Rs
55.32 to 51.58 on coated enzymes supplemented diets. It is concluded that
supplementation of coated enzymes offered better protection against pelletization
temperature and gastric conditions in the gut there by retaining maximum efficacy over
uncoated enzymes. Hence, coating of enzymes is suggested
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