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
