Nitrogen requirement for maintenance in Yangzhou goslings

Area of Science:

• Animal Nutrition
• Poultry Science
• Biochemistry

Background:

• Determining the precise nitrogen requirement for maintenance (N(m)) is essential for formulating optimal diets for poultry.
• Yangzhou goslings are a significant breed, and understanding their nutritional needs supports efficient production.

Purpose of the Study:

• To accurately quantify the nitrogen requirement for maintenance (N(m)) in Yangzhou goslings.
• To validate the N(m) estimation using two distinct nitrogen balance methodologies.

Main Methods:

• Nitrogen balance tests were conducted on 56-day-old Yangzhou goslings fed diets varying in crude protein (CP) content.
• A subsequent nitrogen balance test utilized an N-free diet with varying intake levels (0, 50, 70, 90 g/d) to estimate N(m).
• Nitrogen output (N(E)) and nitrogen intake (N(I)) were measured to calculate N(m) based on the relationship between N(E) and N(I).

Main Results:

• The nitrogen balance test estimated N(m) at 240 mg/kg BW(0.75) per day.
• The N-free diet trial yielded a consistent N(m) value of 244 mg/kg BW(0.75) per day.
• Lower N-free diet intake led to increased N(E), indicating potential protein catabolism to meet N(m) when dietary N(I) was minimal.

Conclusions:

• The nitrogen requirement for maintenance (N(m)) in Yangzhou goslings is approximately 240 mg/kg BW(0.75) per day.
• The findings from both nitrogen balance methods confirm this value, providing a reliable basis for dietary formulation.
• Understanding N(m) is critical for preventing protein catabolism and ensuring efficient nutrient utilization in growing goslings.