Determining the optimal threonine:lysine ratio in starter diets for the segregated early-weaned pig (1996)

Authors

J R. Bergstrom
W B. Nessmith Jr
C A. Civis
Jim L. Nelssen
Michael D. Tokach
Robert D. Goodband

Keywords

Swine day, 1996; Kansas Agricultural Experiment Station contribution; no. 97-142-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 772; Swine; Early-weaned pigs; Amino acids; Threonine

Abstract

A 14-day growth trial was conducted to determine the threonine: lysine ratio necessary to optimize growth performance of the segregated early-weaned (SEW) pig. Twelve experimental diets included two levels of lysine (1.15% and 1.5% apparent digestible lysine) and six apparent digestible threonine: lysine ratios (40, 45, 50, 55, 60, and 65 %) in a 2 x 6 factorial arrangement. Growth performance was improved by feeding 1.5% rather than 1.15% digestible lysine. Growth performance decreased linearly as the digestible threonine: lysine ratio increased. Although a significant quadratic response was not observed, this reduction in growth performance did not appear to occur until the threonine ratio exceeded 45% of lysine on an apparent digestible basis. These data indicate that the threonine requirement for the SEW pig is approximately 45% of digestible lysine.; Swine Day, Manhattan, KS, November 21, 1996

Recommended Citation

Bergstrom, J R.; Nessmith, W B. Jr; Civis, C A.; Nelssen, Jim L.; Tokach, Michael D.; and Goodband, Robert D. (1996) "Determining the optimal threonine:lysine ratio in starter diets for the segregated early-weaned pig (1996)," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 10. https://doi.org/10.4148/2378-5977.6517