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Utilization of corn-based diets supplemented with an exogenous α-amylase for broilers.

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Supplemental alpha-amylase improved energy and nutrient utilization in broiler chickens fed corn-soy diets. Optimal enzyme levels varied with corn concentration, indicating a link between amylase dosage and dietary starch content.

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Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Enzyme Technology

Background:

  • Corn and soy are primary ingredients in broiler chicken diets.
  • Variable corn inclusion can affect nutrient utilization.
  • Exogenous enzymes like alpha-amylase can enhance nutrient digestibility.

Purpose of the Study:

  • To evaluate the impact of supplemental alpha-amylase on energy and nutrient utilization in broiler chickens.
  • To determine the effects of varying corn inclusion levels in diets.
  • To identify optimal alpha-amylase dosage based on dietary starch concentration.

Main Methods:

  • 480 male broiler chickens were fed diets with conventional (CS) or high corn (CN) content.
  • Diets were supplemented with varying levels of alpha-amylase (40-160 KNU/kg).
  • Ileal digestible energy, AMEn, and nutrient digestibility (DM, protein, fat) were analyzed.

Main Results:

  • The high corn diet (CN) showed lower energy utilization and nutrient digestibility than the conventional corn diet (CS).
  • Supplementation with 80 KNU/kg alpha-amylase increased AMEn and IDE significantly.
  • Alpha-amylase addition improved growth performance and nutrient digestibility in a dose-dependent manner, with optimal levels varying by diet composition.

Conclusions:

  • Alpha-amylase supplementation enhances energy and nutrient utilization in corn-soy based broiler diets.
  • The optimal dosage of alpha-amylase is associated with the dietary starch concentration.
  • Enzyme supplementation can mitigate negative effects of higher corn inclusion on broiler performance.