The effect of different doses of heat-resistant amylase on the performance of broilers fed wheat or corn-based diets

Abstract

Introduction: The aim of this study was to investigate the effect of heat resistance amylase
in wheat-based diets and compare normal and heat resistant amylase within broilers. Due to
its advantages over corn as the main grain used by poultry, wheat can reduce feed production
costs and ultimately increase production efficiency.
Materials & Methods: For this purpose, 2880 ROSS 308 broilers were randomly divided
into groups of 15 and a total of 196 birds in each group. For each of the initial, middle, and
final rearing periods, the diets were adjusted using wheat or corn cereals. At the beginning
of the experiment, all 15 chickens were weighed together and assigned to experimental pens.
At the end of days 7, 14, 21, 28, 35, and 42 days, all chickens in each pen were weighed
together. Average body weight, body weight gain, feed intake, and feed conversion ratio
were calculated in the experiment.
Result: The results of this study showed that on day 35, the chicks in the group which
received 600 μ/Kg heat-resistance amylases and the group which received 200 μ/Kg normal
amylase showed better performance compared to the control group (p<0.05). Moreover, the
results on day 42 of the experiment showed that the weight of chickens which received 600
μ/Kg of heat-resistant amylase and 200 μ/Kg of normal amylase was higher than other
groups except the group which fed by a diet supplemented with 400 μ/Kg normal amylase.
Holding was higher (p<0.05). The results of this study indicated that feed intake and feed
conversion ratio were not affected by experimental treatments (p>0.05).
Conclusion: According to the results of this experiment, the use of alpha-amylase improves
the performance of broilers during the rearing period. Using heat-resistant amylase also
showed a better performance than normal amylase.