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 + ‚-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 + ‚-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 ‚-mannanase in the maize-SBM diet. Dressed yield showed a trend to improve (P = 0.08) upon ‚-mannanase supplementation.
Highlights
Guar (Gyamopsis tetragonoloba) is a drought resistant annual legume predominantly grown in India and Pakistan [1]
It was concluded that partial replacement of soybean meal (SBM) with guar korma may not yield any substantial benefits in terms of performance and carcass traits and that supplementation of β-mannanase may not be worthwhile in alleviating the negative effects of guar korma
Performance evaluation of the birds (Table-2) indicated that at 14 day, Live weight (LW) of the guar korma fed groups was inferior to the SBM fed ones and that mannanase supplementation did not revert this effect
Summary
Guar (Gyamopsis tetragonoloba) is a drought resistant annual legume predominantly grown in India and Pakistan [1]. The plant is primarily grown for its galactomannan polysaccharide gum which has numerous industrial and food processing applications [2]. Guar meal is the main by-product of guar gum production with a protein content of approximately 380 g/kg [3]. It is a mixture of germs and hulls at an approximate ratio of 25 % germ to 75 % hull [4]. The high amino acid content of the guar meal protein makes it a useful protein supplement for broilers and layers. Some of the anti-nutritional agents (trypsin inhibitors, gum residue, saponins) present in guar meal limit its usage at high levels in broiler diets
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