EFFECT OF ENZYMES SUPPLEMENTATION ON PERFORMANCE OF COMMERCIAL BROILERS
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Date
2013
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AAU, Anand
Abstract
The experiment was conducted to study effect of enzymes supplementation on performance of commercial broilers. One hundred and sixty (160) day old commercial broiler chicks were distributed randomly into four treatments. T1 ration was considered as control (without enzyme). T2, T3 and T4 ration contains enzymes at the rate of 25g, 50g and 75g per 100 kg feed, respectively in broiler starter as well as in broiler finisher ration. The each gram of commercial enzymes mixture used in the experiment contains: Xylanase (2,000 IU), Amylase (400 IU), Protease (4000 IU) and Cellulase (500 IU). Each treatment was having 4 replicates of 10 birds each. The initial mean body weight (g) of day old age chicks (BWQ) was found to be 49.67 ± 0.11, 49.61 ± 0.05, 49.67 ± 0.07 and 49.68 ± 0.08 which was non-significant and finally reached to average body weight (g) of 1975.53 ± 23.28, 2011.75 ± 12.73, 2054.41 ± 17.95 and 2093.02 ± 43.98 at the end of experiment (6th week) under treatment rations T1, T2, T3 and T4 rations, respectively. The mean body weight gain (g) of birds during 0-6 weeks of age fed with T1, T2, T3 and T4 rations was found to be 1925.85 ± 23.39, 1962.10 ± 12.75, 2004.74 ± 17.91 and 2043.38 ± 43.94, respectively. The birds fed with T4 ration recorded significantly higher body weight gain than control (T1). The mean body weight gain of birds during 0 to 4 weeks (starter phase) and 0 to 6 weeks of age was significant but non-significant differences were observed during 4 to 6 weeks of age (finisher phase). The significant increase in average body weight and body weight gain on enzyme supplementation clearly indicates the beneficial effects of supplementing enzymes in improving the nutrient utilization required for the growth. The mean total feed consumption (g/bird) during 0 to 4 weeks of age fed with T1, T2, T3 and T4 rations was found to be 1752.9 ± 10.84, 1756.02 ± 10.23, 1777.12 ± 10.99 and 1707.83 ± 21.02, respectively. Feed consumption of birds fed with T1, T2 and T3 rations was significantly (P<0.05) higher than T4. The differences in feed consumption among different treatment rations were non-significant during 5 to 6 weeks and during 0 to 6 weeks of age. The feed conversion ratio of birds from 0 to 4 weeks of age fed with T1, T2, T3 and T4 rations was found to be 1.873 ± 0.011, 1.835 ± 0.032, 1.803 ± 0.035 and 1.659 ± 0.015, respectively. Feed conversion ratio of birds fed with T4 ration was significantly (P<0.05) better than T1,T2 and T3 rations. However, the differences in feed conversion ratio among different treatment rations were found to be nonsignificant during 5 to 6 weeks of age. The feed conversion ratio of birds from 0 to 6 weeks of age fed with T1, T2, T3 and T4 rations was found to be 1.975 ± 0.036, 1.890 ± 0.018, 1.872 ± 0.030 and 1.789 ± 0.036, respectively. Feed conversion ratio of birds fed with T4 ration was significantly (P<0.05) better than T1 and T2 but differ non-significantly with T3 ration. The significantly improved feed conversion ratio in enzyme supplementation clearly indicates the beneficial effects of supplementing enzymes in improving the nutrient utilization from rations. The livability in the birds fed with T1, T2, T3 and T4 rations was 97.5% 100%, 97.5% and 100%), respectively. Enzyme supplementations do not have any adverse effect on the livability of the birds. Economy in terms of Return over Feed Cost (ROFC) of birds fed with T1, T2, T3 and T4 rations was found to be (Rs./bird) 58.12, 62.67, 64.73 and 69.66, respectively. Economy calculating in terms of European Performance Efficiency Index (EPEI) of birds fed with T1, T2, T3 and T4 rations at 6th week of age (42 days) was found to be 232.01, 253.37, 254.90 and 279.18. Birds fed with T4 ration were having higher EPEI than T3 followed by T2 and control (T1) ration. Profit increases as the level of enzymes supplementation in broiler ration increased and highest profit was noted @ 75g/100 kg feed of enzymes supplementation than other treatment rations. The carcass characteristics like pre-slaughter live weight, dressed weight, dressing percentage, liver weight, heart weight, gizzard weight, giblet weight, abdominal fat, kidney weight and intestinal length were found to be non-significant among birds fed under different treatment rations. For better growth performance, feed efficiency, profitability and livability, the enzymes should be supplemented @ 75g/ 100kg of feed in the broiler ration.
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Poultry Science, A Study