Optimal in-feed amino acid ratio for laying hens based on deletion method

Area of Science:

• Animal Nutrition
• Poultry Science
• Nutrient Metabolism

Background:

• Accurate estimation of nutrient requirements is crucial for efficient poultry production.
• Understanding nitrogen metabolism and amino acid needs optimizes feed formulation and reduces environmental impact.

Purpose of the Study:

• To determine daily nitrogen maintenance requirements (NMR) and maximum nitrogen retention (NRmax T) in Hy-line W-36 hens.
• To establish the ideal amino acid ratio (IAAR) for pullets using two different methodologies.

Main Methods:

• Nitrogen balance (NB) trials were conducted with Hy-line W-36 hens at varying dietary nitrogen levels.
• Regression analysis was used to calculate NMR and NRmax T.
• A second NB trial estimated IAAR using the Goettingen and Louvain approaches with diets formulated by dilution and supplementation.

Main Results:

• Daily nitrogen maintenance requirements (NMR) were determined as 292 mg/BWkg^0.67.
• Maximum nitrogen retention (NRmax T) was calculated as 1,883 mg/BWkg^0.67.
• Ideal amino acid ratios were established using both Goettingen and Louvain approaches, showing slight variations for certain amino acids.

Conclusions:

• The study provides essential data for optimizing nitrogen utilization in Hy-line W-36 hens.
• Established IAAR values can guide precise feed formulation, enhancing poultry growth and health.
• The findings contribute to sustainable poultry farming practices through improved nutrient management.