Katoch, ShivaniSood, Radhika Rajshree2019-01-242019-01-242018http://krishikosh.egranth.ac.in/handle/1/5810092239The study was conducted to evaluate the effect of exogenous feed enzymes viz. Hizyme and Phytase on the biological growth performance of commercial broiler poultry birds. For this purpose, day old broiler chicks (n=100) were divided into 5 main treatment groups viz. T0, T1, T2,T3and T4 under completely randomized block design. Each treatment group was further divided in 2 replicates with 10 chicks in each. T0 served as standard control diet and was given standard corn- soy flake based ration. Treatment T1 was given standard corn- soy flake based ration along with Hizyme at the rate of 25 grams per quintal feed and Phytase at the rate of 5grams per quintal(Activity -5000FTU) i.e. 250 FTU/Kg feed whereas T2 was given ration containing 5 percent lower calculated metabolizable energy(ME), Ca and P along with Hizyme and Phytase whereas treatment T3 was given ration containing 5 percent lower calculated minerals viz Ca and P along with phytase and treatment T4 was given ration with 5 percent lower calculated ME along with enzyme Hizyme. All the five broiler diets were formulated and prepared conferring to BIS (1992) standards. Formulated diet with 5 per cent lower metabolizable energy with addition of exogenous feed enzymes in treatment T4 exhibited increased growth rate, feed intake, feed conversion, dressing yield and profitability.Supplementation of Hizyme at the rate 25 grams/quintal and phytase 5grams/quintal improved gain in live weight and improved feed conversion ratio (FCR) in all treatments viz.T1, T2, T3andT4.Phytase supplementation @ 250 FTU/Kg feed did not compensate for the deficit in calcium and phosphorus as per BIS standards in treatment T2 during the starter phase but during the finisher phase the birds exhibited comparable weight gain and FCR compared to control T0.Hizyme and Phytase supplementation significantly (P<0.05) increased the crude fibre digestibility in treatment T2 compared to control group. Phosphorus digestibility was significantly (P<0.05) higher in treatment group T1, T2, T3 and T4 compared to control group. Tibial bone calcium content did not exhibit any difference in control and all the other treatments whereas the tibial bone phosphorus and magnesium content was significantly (P<0.05) reduced in treatment T3 and T4 compared to standard formulated diet T1. Blood parameters were not affected by supplementation of enzymes.Dressing percentage was not affected by reduction in ME, Ca and P, although live weight and dressed weight were significantly (P<0.05) higher in treatment group T1 compared to treatment group T2 and T3. Cost of feed per kilogram gain in live weight was lowest in treatment T4 (Rs. 41.83/Kg) supplemented with Hizyme and second lowest in treatment T2 (Rs. 42.27/Kg) where as it was highest in control group T0 (Rs. 46.82/Kg).ennullThesis