Abstract
Effects of Dietary Standardized Ileal Digestible Isoleucine:Lysine Ratio on Nursery Pig Performance
Highlights
The inclusion of crystalline amino acids in swine diets is an effective strategy to meet specific nutritional requirements, and reduce diet cost and environmental impact
A total of 560 nursery pigs were used in 2 experiments to evaluate the effects of increasing dietary standardized ileal digestible (SID) Isoleucine:Lysine (Ile:Lys) ratio on growth performance
For ADFI, the broken-line linear (BLL) breakpoint occurred at 50.6% and the Quadratic polynomial (QP) predicted maximum ADFI at 56.2% SID Ile:Lys ratio
Summary
The inclusion of crystalline amino acids in swine diets is an effective strategy to meet specific nutritional requirements, and reduce diet cost and environmental impact. Amino acids are expressed in ratio to lysine (Lys) for diet formulation process. It is important to evaluate essential amino acids in a Lys deficient scenario to appropriately identify the requirement of the essential amino acid of interest. A previous experiment conducted at Kansas State University demonstrated that the Lys requirement for 15 to 25 lb pigs was 1.45% SID Lys. Previously, we have determined the Thr, Met, Trp, and Val to Lys ratios for pigs from 15 to 25 lb. Our step was to determine the appropriate SID Ile:Lys ratio for pigs in this stage of growth
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