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Influence of non starch polysaccharide-degrading enzymes on
the meat yield and viscosity of jejunal digesta in broilers
fed wheat/barley-based diet
Hassan Shirzadi*, Hossein Moravej, Mahmood Shivazad
Department
of Animal Science, Faculty of Agriculture and Natural
Resources, Tehran University, P.O. Box #3158711167-4111,
Karaj, Iran
*Corresponding author.
E-mail:
h_shirzadi@yahoo.com. Tel: +98 261 2248082. Fax: +98 261
2246752
Accepted
30 December, 2009 |
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This study
was conducted to investigate the effect of four commercial
multi-enzymes on the performance, meat yield, water intake,
litter moisture and jejunal digesta viscosity of chicks fed
wheat/barley based diet. A total of 195 1-d-old male broiler
chicks (Ross 308) were allocated to 5 treatment groups, with
3 replicates per treatment group and 13 birds per replicate
pen and all data were analyzed in a randomized complete
block design. During the starter period, feed conversion
ratio (FCR) was significantly (P < 0.05) decreased by only
enzymes A, B and D. Moreover, FCR was significantly (P <
0.05) decreased by all enzymes in grower and entire periods.
The relative weight of the breast as proportion of live
weight was significantly (P < 0.05) decreased by only enzyme
A. The relative weight of the abdominal fat as proportion of
live weight was also significantly (P < 0.05) increased by
enzyme D. Enzyme supplementation decreased viscosity of
jejunal contents of chicks at day 28, but only enzymes A and
D reduced significantly (P < 0.05) the viscosity of jejunum
compared to control diet. In conclusion, there were similar
improvements on FCR of birds fed diets with enzyme
supplementation and choice preference of enzyme
supplementation has to be base on its economic value.
Key
words:
b-glucanase,
xylanase, broilers, performance, meat yield, water intake,
litter moisture, viscosity. |
