True digestibility

Determination of endogenous intestinal losses of calcium and apparent and true total tract digestibility of calcium in canola meal fed to growing pigs

When formulating diets for pigs, it is more accurate to use values for standardized or true nutrient digestibility than values for apparent nutrient digestibility because the former are additive in mixed diets. No values for standardized or true total tract digestibility of calcium in pigs have been reported. The true total tract digestibility (TTTD) of a nutrient is calculated by correcting apparently total tract digestibility (ATTD) by total endogenous losses, which may be estimated using a regression procedure. To our knowledge, no measurements of the endogenous loss of calcium in pigs have been reported. An experiment was, therefore,  performed to measure endogenous loss of calcium and to determine TTTD of calcium in growing pigs, and to investigate if  the addition of microbial phytase to the diets affects TTTD of calcium. In addition, calcium retention was measured in pigs fed diets containing varying levels of calcium with or without microbial phytase.

Effect of the form of dietary fat and the concentration of dietary neutral detergent fiber on ileal and total tract endogenous losses and apparent and true digestibility of fat by growing pigs

Kil, D. Y., T. E. Sauber, D. B. Jones, and H. H. Stein. 2010. Effect of the form of dietary fat and the concentration of dietary neutral detergent fiber on ileal and total tract endogenous losses and apparent and true digestibility of fat by growing pigs. J. Anim Sci. 88:2959-2967. Link to full text (.pdf)

Amino acid bioavailability and digestibility in pig feed ingredients: Terminology and application

Stein, H. H., B. Sève, M. F. Fuller, P. J. Moughan, and C. F. M. de Lange. 2007. Invited review: Amino acid bioavailability and digestibility in pig feed ingredients: Terminology and application. J. Anim. Sci. 85:172-180.  Link to full text (.pdf)

Apparent and true total tract digestibility of phosphorus in field peas (Pisum sativum L.) by growing pigs

Stein, H. H., M. G. Boersma, and C. Pedersen. 2006. Apparent and true total tract digestibility of phosphorus in field peas (Pisum sativum L.) by growing pigs. Can. J. Anim. Sci. 85:523-525. Link to full text (.pdf)

Novel procedure for estimating endogenous losses and measuring apparent and true digestibility of phosphorus by growing pigs

Petersen, G. I., and H. H. Stein. 2006. Novel procedure for estimating endogenous losses and measuring apparent and true digestibility of phosphorus by growing pigs. J. Anim. Sci. 84:2126-2132. Link to full text (.pdf)