Chemical composition and nutritional evaluation of variously treated defatted rice polishing for broiler feeding

Abstract

The study was conducted to improve the nutritive value of defatted rice polishing (DRP). DRP was treated with various concentrations of HCl, NaOH, H2O2 and Kemzyme-H F® and the effect on its chemical composition and nutritive value in broiler chicks was observed. The treatments levels of 0.4 N HCl, 0.2 N NaOH and 6% H2O2 were selected from many concentrations of HCl, NaOH and H2O2 tried earlier on DRP. The selection was made on the basis of release of nutrients from DRP. The Kemzyme-H F® was used at rate of 0.1% of DRP. The selected concentrations of HCl, NaOH, and H2O2 were then used for treatment of DRP that was used in biological experiments. Two hundred and forty, day-old Hubbard male broiler chicks (38-40 g) were randomly divided into 48 experimental units with five chicks each. Each chemically treated DRP was incorporated into broiler diets at 10, 20 or 30% levels replacing yellow corn from the control feed and thus sixteen experimental feeds were prepared. These feeds were randomly assigned to 48 experimental units such that there were three replicates of chicks on each diet. The results of the study suggest that DRP can be effectively used in broiler diets at 20% level. The best weight gain and feed conversion ratio were observed with diet containing 20% level of DRP treated with 6% H2O2. The diets containing 30% levels of treated DRP were uneconomical, as excess use of oil was required to compensate the energy needs of the birds.