Efficiency of lysine utilization by growing meat quail

Area of Science:

• Animal Nutrition
• Poultry Science
• Nutrient Metabolism

Background:

• Lysine is a critical essential amino acid for poultry growth and feather development.
• Optimizing lysine levels is crucial for maximizing meat production efficiency in quails.
• Understanding lysine utilization efficiency informs feed formulation and economic viability.

Purpose of the Study:

• To estimate the efficiency of lysine utilization in meat quails aged 21 to 35 days.
• To compare different statistical methods for estimating lysine utilization efficiency.
• To determine sex-specific differences in lysine utilization.

Main Methods:

• A completely randomized design with 500 meat quails (male and female) was used.
• Five digestible lysine levels were tested (0.714% to 1.122%).
• Body weight, feed intake, and nutrient deposition (protein, lysine, fat) in feather-free body and feathers were analyzed using regression analyses.

Main Results:

• Females exhibited higher feather-free body weight and fat deposition than males.
• Nutrient deposition in the feather-free body increased with dietary lysine levels, except for feed intake and feather weight.
• Lysine utilization efficiency for the feather-free body (ELysFFB) was estimated at 46.3% (average), and for feathers (ELysF) at 18.1%.

Conclusions:

• Dietary lysine levels significantly impact growth and nutrient deposition in meat quails.
• No significant sex x lysine level interactions were observed for the studied variables.
• The estimated lysine utilization efficiencies provide valuable data for optimizing quail nutrition and production.