Reduced dietary phosphorus levels for layers

Area of Science:

• Animal Science
• Poultry Nutrition
• Avian Physiology

Background:

• Dietary phosphorus is crucial for poultry health and egg production.
• Optimizing phosphorus levels in feed is essential for economic viability and environmental sustainability.
• White Leghorn hens have specific nutritional requirements for optimal performance.

Purpose of the Study:

• To investigate the effects of low dietary phosphorus on White Leghorn hen performance.
• To determine the threshold for available phosphorus in corn-soybean meal diets.
• To assess phosphorus excretion in hens fed varying phosphorus levels.

Main Methods:

• Two experiments were conducted with White Leghorn hens aged 18 to 64 weeks.
• Diets with varying available phosphorus levels (.2%, .3%, and .4%) were fed.
• Egg production, shell quality, egg weight, and phosphorus excretion were measured.

Main Results:

• A diet with .2% available phosphorus reduced egg production after 32 weeks but not at earlier stages.
• Diets with .3% and .4% available phosphorus showed no significant differences in performance variables.
• Hens fed lower phosphorus diets exhibited a 20% reduction in phosphorus excretion.

Conclusions:

• Available phosphorus levels below .3% negatively impact White Leghorn hen egg production beyond 32 weeks.
• Reducing dietary phosphorus can significantly decrease phosphorus excretion in poultry.
• Optimal dietary phosphorus levels are critical for sustained egg production and reduced environmental impact.