NUTRITIVE VALUE AND ENZYME SUPPLEMENTATION OF SORGHUM BREWER’S WASTE IN BROILER DIETS

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NUTRITIVE VALUE AND ENZYME SUPPLEMENTATION OF SORGHUM BREWER’S WASTE IN BROILER DIETS

Abstract:

Two experiments were conducted to evaluate the nutritive value and enzyme supplementation of sorghum brewer‟s waste (SBW) in broiler diets. In Experiment I, 225 one-week old broiler chickens with an average initial live weight of 73g were fed diets containing graded levels of SBW. There were five dietary treatments for both starter and finisher phases. The treatments were replicated three times with fifteen birds per replicate and a total of forty five birds per treatment in a completely randomized design. Treatments 1, 2, 3, 4 and 5 contained 0, 10, 20, 30 and 40% SBW, respectively. Results showed that at the starter phase, there were no significant differences (P>0.05) among the treatments up to 40% SBW while the finisher birds performed better in terms of final weight and weight gain up to 30% level of inclusion. Digestibility of crude protein and crude fibre were better up to 20% and were similar to those fed 30% inclusion of SBW. Dietary treatments had significant (P<0.05) effect on live weight, dressing percentage, breast, thigh, back, gizzard, liver, intestinal length and intestinal weight. At 40% level of SBW, thigh, back, gizzard, liver, intestinal length and intestinal weight were highest. In Experiment II, 225 one-week old broilers with an average initial live weight of 80g were used to evaluate the effect of Rovabio® enzyme supplementation at 0.01% on the performance, carcass characteristics and digestibility of nutrients by broilers fed diets containing 0, 30, 35, 40 and 45% SBW in Treatments 1, 2, 3, 4 and 5, respectively. Design and management of experimental birds were same as described in Experiment I. Results obtained at the starter phase showed that Rovabio® enzyme supplementation significantly (P<0.05) affected feed intake and feed cost per kilogram gain. Average feed intake was highest in birds fed 40% and similar to those fed 45% SBW plus enzyme, respectively while Feed cost per kilogram gain was lowered in birds fed 35 and 45% SBW. At the finisher phase, enzyme supplementation significantly (P<0.05) affected feed intake, feed conversion ratio and feed cost per kilogram gain. Average feed intake was highest up to 30% and similar to those fed 35% SBW. Feed conversion ratio was best with birds fed 40 and 45% SBW and significantly (P<0.05) lower than birds on the control diet. Dietary treatments had no effect on the final weight, weight gain and mortality rate of the birds. Birds on 35% SBW plus enzyme had highest digestibility in terms of crude protein and crude fibre and similar to those on 40%. Digestibility of ash was highest in birds fed the control diet and similar to those fed up to 40%. Significant (P<0.05) differences were observed on the carcass parameters measured except for the live weight, dressing%, drumstick, heart, spleen, intestinal weight and length. The results from these studies suggested that Sorghum Brewer‟s Waste can be economically fed to broilers up to 33.33% as obtained using a regression analysis with the feed cost/kg gain at the finisher phase as the parameter used without inclusion of exogenous enzymes. However, the use of Rovabio® enzyme enhanced the performance of birds up to 45% inclusion level in terms of feed cost per kilogram gain.

NUTRITIVE VALUE AND ENZYME SUPPLEMENTATION OF SORGHUM BREWER’S WASTE IN BROILER DIETS

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