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Minimum phosphorus requirements for laying hen feed formulations.

Markus Rodehutscord¹, Vera Sommerfeld¹, C Roselina Angel²

¹Institute of Animal Science, University of Hohenheim, 70599, Stuttgart, Germany.

Poultry Science

|December 8, 2022

Summary

For laying hens, a maximum of 2.2 g nonphytate phosphorus (NPP) per kg of feed is sufficient, especially when phytase is used. Optimizing NPP levels supports sustainable egg production and hen health.

Keywords:

dietary allowances laying hen phytase phytate review

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Area of Science:

Animal Science
Nutritional Biochemistry
Poultry Science

Background:

Determining optimal nonphytate phosphorus (NPP) levels in laying hen diets is crucial for efficient nutrient utilization and sustainable egg production.
Existing research, including a 2012 meta-analysis and subsequent studies, provides data on NPP requirements and the impact of phytase supplementation.

Approach:

A comprehensive review of scientific literature was conducted to synthesize optimal nonphytate phosphorus (NPP) concentrations for laying hens.
Studies involving variations in mineral phosphorus sources and phytase supplementation were analyzed, considering different production periods.

Key Points:

No performance or eggshell quality benefits were observed when NPP exceeded 2.2 g/kg without phytase.
While bone quality data is limited, no consistent negative effects were found at this NPP level.
Phytase supplementation increases phytate degradation but its effects on performance and bone traits in laying hens are less conclusive, potentially due to adequate NPP supply.

Conclusions:

A dietary concentration of 2.2 g NPP/kg feed appears sufficient for laying hens across different production stages.
Reducing NPP levels is feasible with phytase addition, though precise reduction values depend on feed phytate content and phytase dosage, requiring further research.
Shifting to a digestible phosphorus system, similar to broilers, could enhance phosphorus precision and sustainability in laying hen nutrition.