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Phytase Improves Zinc Utilization by Broiler Chickens.

Douglas Drebes Brunhaus Maria1, Sergio Luiz Vieira1, Raquel Medeiros Horn1

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|December 17, 2024
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Summary
This summary is machine-generated.

Phytase significantly enhanced broiler chicken performance by improving zinc (Zn) absorption and retention from feed. Increasing dietary zinc levels did not benefit performance, indicating phytase is key for optimal Zn utilization.

Keywords:
broilerphytasezinc

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Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Biochemistry

Background:

  • Zinc (Zn) is crucial for broiler chicken growth and health.
  • Phytase enzymes can improve nutrient digestibility by breaking down phytate, a common anti-nutritional factor in plant-based feeds.
  • Understanding Zn requirements and the efficacy of phytase in broiler diets is essential for optimizing feed formulations.

Purpose of the Study:

  • To evaluate the effect of phytase on zinc bioavailability from corn and soybean meal-based diets for broiler chickens.
  • To investigate the dietary zinc requirements of broiler chickens under different phytase supplementation levels.
  • To assess the impact of phytase and supplemental zinc on broiler performance, Zn retention, and tissue Zn content.

Main Methods:

  • A 2x5 factorial experiment using 640 male broiler chicks fed a Zn-deficient diet initially.
  • Ten dietary treatments were established: diets with or without phytase, combined with five increasing levels of supplemental zinc sulfate.
  • Responses were evaluated based on broiler performance, plasma myo-inositol, liver and tibia Zn content, Zn retention, and digestible energy.

Main Results:

  • Phytase supplementation significantly improved broiler performance, plasma myo-inositol, liver and tibia Zn content, Zn retention, and digestible energy (p < 0.05).
  • No significant interactions were observed between phytase and dietary Zn levels for any measured response.
  • Dietary Zn supplementation up to 151.9 mg/kg did not significantly impact broiler performance, although it affected Zn excretion and tibia Zn content.

Conclusions:

  • Phytase effectively enhances zinc bioavailability and retention in broiler chickens fed corn and soybean meal-based diets.
  • The addition of phytase at 4000 FYT significantly increased apparent ileal Zn digestibility and Zn retention.
  • Dietary zinc supplementation beyond a certain level may not be necessary when phytase is included in the diet, suggesting a potential for reduced inorganic Zn usage.