The Optimal Valine to Lysine Ratio for Performance Parameters in Weaned Piglets

Area of Science:

• Animal Nutrition
• Swine Physiology
• Nutrient Requirements

Background:

• Valine and Lysine are essential amino acids for piglet growth.
• Optimizing the digestible Valine to digestible Lysine ratio (dVal:dLys) is key for efficient animal production.
• Understanding these ratios impacts feed formulation and economic viability.

Purpose of the Study:

• To determine the optimal digestible Valine (Val) to digestible Lysine (Lys) ratio (dVal:dLys) for weaned piglets.
• To evaluate the impact of L-valine supplementation on piglet growth performance.
• To compare two regression models for estimating optimal amino acid ratios.

Main Methods:

• 200 weaned piglets were fed diets with varying dVal:dLys ratios.
• Corn-soybean meal based diets were supplemented with crystalline L-valine.
• Exponential Asymptotic (EA) and Curvilinear-Plateau (CLP) models were used to analyze body weight gain and feed intake data.

Main Results:

• L-valine supplementation improved body weight gain and feed intake in piglets.
• The estimated optimal dVal:dLys for body weight gain was 0.68 (EA) and 0.67 (CLP) in the starter phase.
• The optimal dVal:dLys for the total trial period was estimated at 0.65 for both models.

Conclusions:

• Supplementing valine-deficient diets with L-valine enhances piglet weight gain and feed intake.
• A dVal:dLys ratio of 0.68 is recommended for optimizing body weight gain in weaned piglets.
• Regression modeling provides valuable insights into precise nutrient requirements for swine.