Abstract: This study was conducted to determine the effect of early feed restriction with or without enzyme supplementation on performance, nutrients digestibility and some blood parameters in broiler chickens. About 360, 1 day old mixed sex broilers (ROSS-308) were randomly selected and distributed to 8 experimental groups. Treatments were assigned in a completely randomized design with factorial arrangement (2x4) including 2 levels of enzyme (with and without supplement) and 4 levels of feed restriction (0, 10, 20 and 30%) which adopted from 7-14 days of broilers age. The performance parameters including gain, feed intake and feed conversion ratio were recorded at the end of each week. Blood sampling was done at 14 days of age to determine the blood biochemical characteristics after the restriction period. In order to determination of nutrients digestibility birds fed with experimental diets which included with chromic oxide as an indigestible marker and ileal digesta was collected at 21 days of age. At the end of experiment (42 days of age) carcass analysis was done for 3 birds per each pen. The results of this experiment indicated that the effects of treatments on broilers performance and carcass characteristics were not statistically significant (p>0.05). The result showed that the feed restriction with enzyme had an increasing effects on crude protein and crude fat digestibility (p<0.05). Besides, feed restriction had a significant effect on glucose and cholesterol (p<0.05) however, it did not affect blood triglyceride (p>0.05). By referring to the results of this experiment, it can be adopted feed restriction in broiler training without decrease in broiler performance.
Vahid Rezaeipour, Masoud Palangi and Mehrdad Irani, 2012. Effect of Early Feed Restriction with or without Enzyme Supplementation on Performance, Nutrients Digestibility and Blood Biochemical Parameters of Broiler Chickens. Journal of Animal and Veterinary Advances, 11: 622-626.