Effects of Increasing Standardized Ileal Digestible Lysine on Growth Performance of 40- to 90-Pound DNA Pigs

Authors

Rafe Q. Royall, Kansas State UniversityFollow
Robert D. Goodband, Kansas State UniversityFollow
Mike D. Tokach, Kansas State UniversityFollow
Joel M. DeRouchey, Kansas State UniversityFollow
Jordan T. Gebhardt, Kansas State UniversityFollow
Jason C. Woodworth, Kansas State UniversityFollow

Keywords

amino acid, growth, lysine requirement, grow-finish pig

Abstract

The objective of this study was to estimate the SID Lys requirement for growth and feed efficiency of 40- to 90-lb DNA pigs. A total of 300 pigs (600 × 241, DNA; initially 40.6 ± 1.11 lb) were used in a 24-d trial. Pens of pigs were blocked by BW and randomly allotted to 1 of 6 dietary treatments with 5 pigs per pen and 10 pens per treatment in a randomized complete block design. Dietary treatments were corn-soybean meal-based and formulated to contain 1.00, 1.10, 1.20, 1.30, 1.40, and 1.50% SID Lys. Increasing SID Lys increased (linear,P= 0.003) ADG, decreased (linear,P= 0.012) ADFI, and improved (linear,P<0.001) feed efficiency. While these responses were linear, the greatest improvement in growth performance was observed as SID Lys increased from 1.00 to 1.10%. Although increasing SID Lys further slightly improved performance, the change was not great enough to economically justify feeding greater than 1.10% SID Lys. The quadratic polynomial model to maximize ADG predicted the maximum growth at 1.41% SID Lys. For F/G, the broken-line linear model predicted no further improvement past 1.35% SID Lys, while a similar fitting quadratic polynomial model predicted the optimum feed efficiency beyond the highest tested level of SID Lys. Additionally, the broken-line linear model for income over feed cost (IOFC) predicted maximum economic return at or below 1.12% SID Lys. In summary, the optimal SID Lys level for DNA pigs from 40 to 90 lb depends upon the response criteria, with growth performance maximized between 1.35 and>1.50% SID Lys; however, economic responses were maximized at or below 1.12% SID Lys.

Recommended Citation

Royall, Rafe Q.; Goodband, Robert D.; Tokach, Mike D.; DeRouchey, Joel M.; Gebhardt, Jordan T.; and Woodworth, Jason C. (2022) "Effects of Increasing Standardized Ileal Digestible Lysine on Growth Performance of 40- to 90-Pound DNA Pigs," Kansas Agricultural Experiment Station Research Reports: Vol. 8: Iss. 10. https://doi.org/10.4148/2378-5977.8379