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Open Access
Copyright: The authors. This article is an open access
article licensed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/2.0) which permits unrestricted use,
distribution and reproduction in any medium, provided the work is properly
cited.
Research
(Published
online : 20-07-2013)
21. Effects of partial replacement of soybean meal with
roasted guar korma and supplementation of mannanase on performance and carcass
traits of commercial broiler chickens - Abhijit Mishra, Samir Kumar
Sarkar, Subhasish Ray and Sudipto Haldar
Vet World. 2013; 6(9): 693-697
doi:
10.14202/vetworld.2013.693-697
Abstract
Aim: To evaluate the effects
of inclusion of roasted guar meal, also known as guar korma, as a
partial replacement for deoiled soybean meal (SBM) in commercial
broiler diets, on production performance and carcass traits of
Cobb-400 broiler chickens.
Materials and Methods: 1600 one-day-old Cobb-400 broiler
chicks were randomly assigned into four dietary treatments, each
with four replicates (n = 100 chicks per replicate). The diets
were iso-nitrogenous and iso-caloric and included the basal diets
composed of maize and SBM (T0), T0 + β-mannanase (T1) and the
treatment diets in which SBM was partially replaced (20 g/kg in
pre-starter, 50 g/kg in starter and finisher) with guar korma (T2)
and T2 + β-mannanase (T3).
Results: Live weight was unaffected by the dietary
treatments (P > 0.05). Guar korma increased feed intake when
compared with the SBM fed groups (P = 0.01). Feed conversion was
better (P = 0.01) when SBM was fed to the chickens irrespective of
mannanase supplementation. As a consequence the performance index
score was superior (P = 0.04) in the SBM fed groups when compared
to the guar korma fed groups. Across the diets, feed conversion
was superior (P < 0.05) in the T1 group suggesting a beneficial
effect of β-mannanase in the maize-SBM diet. Dressed yield showed
a trend to improve (P = 0.08) upon β-mannanase supplementation.
Conclusion: It was concluded that partial replacement of
SBM with guar korma may not yield any substantial benefits in
terms of performance and carcass traits and that supplementation
of β-mannanase may also not be worthwhile in alleviating the
negative effects of guar korma.
Keywords: β-mannanase, broiler chickens, carcass traits,
guar korma, performance
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