Effects of intact and extracted lipid in diets fed to growing pigs on the digestible energy content and the digestibility of various chemical constituents

Abstract

The effects of dietary lipid source (corn germ vs. corn oil) on digestible energy (DE) and apparent total tract digestibility (ATTD) of various chemical constituents were evaluated in diets fed to growing pigs. Thirty barrows were allotted to one of five treatments with six replicates per treatment. The five diets were comprised of a corn-based basal diet with 15.64 MJ/kg of GE, LCO and LCG diets (containing 1% extracted corn oil or 2% corn germ, respectively) were formulated to maintain 16.00 MJ/kg of GE, as well as HCO and HCG diets (containing 2% extracted corn oil or 12% corn germ, respectively) were formulated to maintain 16.94 MJ/kg of GE. The differences in ATTD of NDF and ADF were neither observed between the LCO and LCG diet nor between the HCO and HCG diet. LCO diet had greater DE and ATTD of GE and EE (p < .01) compared with LCG diet, and HCO diet exceeded HCG diet in these traits (p < .01). Results from this research indicate that dietary corn oil inclusion increased the DE and ATTD of GE and EE of the diet in comparison with diets using corn germ. These results imply that the additional lipid from extracted corn oil results in a more digestible diet compared to diets using intact corn germ and the fibrous components in diets containing corn germ can decrease the ATTD of EE, GE and the DE of diets.