Pork Business has released an article written with David A. Clizer from South Dakota State University, Paul M. Cline of Christenson Farms, and Ryan S. Samuel from SDSU extension on the inclusion of dried distillers grains with solubles in swine diets.
 
It is written that the inclusion of DDGS above 20% in these diets can have a negative impact on the growth performance of pigs (Whitney et al., 2006; Linneen et al., 2008). They have found that an imbalance in the branched chain amino acids, more specifically excess leucine, is one of the potential explanations for a decrease in performance.
 
The studies were conducted at a commercial research facility in southwestern Minnesota on a total of 2,425 pigs with an initial body weight of 87 pounds over a 28-day growing period. There were six dietary treatments containing 30% DDGS and varying levels of SID (standardized ileal digestible) Val:Lys ratios or a corn-soybean meal diet.
 
Results indicated negative effects of excess dietary leucine can be mitigated with a high inclusion of valine (Val) in the growing period and high inclusion of isoleucine (Ile) in the finishing period. Two studies were conducted to validate these requirements from the prediction model in diets containing DDGS during the finishing and growing periods.
A Look At Branched Chain Amino Acid Levels in Swine Diets Containing DDGS