January 07, 2021

Interpretive Summary: Comparison of regression and fat-free diet methods for estimating ileal and total tract endogenous losses and digestibility of fat and fatty acids in growing pigs

Interpretive Summary: Comparison of regression and fat-free diet methods for estimating ileal and total tract endogenous losses and digestibility of fat and fatty acids in growing pigs

By Anne Zinn

A study recently published in the Journal of Animal Science was conducted to compare the regression and fat-free diet methods for estimating ileal and total tract endogenous losses of fat and fatty acids and true digestibility or standardized digestibility of fat and fatty acids in growing pigs. It was hypothesized that similar estimation results would be observed using the regression and fat-free diet methods. Additionally, the research team aimed to compare estimates for endogenous losses and true digestibility or standardized digestibility of fat and fatty acids at the end of  the ileum and over the entire intestinal tract.

The results of the present study showed that estimation of true digestibility and standardized digestibility can be measured over the entire intestinal tract, while the ileal analysis method should be used to determine the endogenous losses of fat, endogenous losses of fatty acids, and true digestibility or standardized digestibility of fatty acids. Results showed there were no differences between estimations of true digestibility and standardized digestibility of fat and fatty acids obtained by the regression and fat-free diet methods, respectively. Additionally, apparent digestibility of fat and fatty acids was affected by the dietary fat intake, but standardized digestibility of fat and fatty acids was not. It was concluded that correcting apparent digestibility for basal endogenous losses of fat and fatty acids obtained by the fat-free diet method can accurately estimate standardized digestibility values of fat and fatty acids.

The full paper can be found on the Journal of Animal Science webpage.