Effect of Dietary Microbial Phytase And Metabolizable Energy Level on The Performance of Broiler Chicks

Abstract

This experiment was conducted to study the effect of dietary microbial phytase and metabolizable energy and their interaction on the performance and dressing percentage of the broiler. A 2×2 factorial arrangement was used. Two levels of microbial phytase (0 and 500 unit/kg) were replicated 4 times with the each of the two levels of metabolizable energy (3000 and 3200 kcal / kg); 96 day old, unsexed broiler chicks was used and experimentally, fed for 6 weeks. All diets formulated to be isonitrogenous (23% crude protein). Health of the stock and performance parameters were recorded. Measures of dressing percentage and financial evaluation were monitored. The results showed that the supplementation of dietary microbial phytase caused a significant (p< 0.05) increasing in the body weight gain and feed intake, while the effect on feed efficiency and dressing percentage was not significant (p>0.05). The effect of dietary metabolizable energy levels on the body weight, feed efficiency and dressing percentage was not significant (p>0.05), but the feed intake was decreased significantly by increasing the level of metabolizable energy. The mortality rate was not affected significantly either by addition of microbial phytase or by dietary metabolizable energy levels. The interaction between the dietary microbial phytase and metabolizable energy was not statistically significant (p>0.05) on weight gain, feed intake, feed efficiency, and dressing percentages of broiler. XI ‫5.962( ‪the control diet (272.7 SD).The net profit was increased from‬‬ ‫‪SD ) to (279.4 SD ) ,when the dietary metabolizable energy decreased‬‬ ‫.‪from 3200 kcal/kg to 3000 kcal/kg‬‬