Maryane S. Faria de Oliveira, John K. Htoo, Hans H. Stein. 2019. Direct vs. difference method to determine amino acid digestibility in ingredients fed to pigs. Journal of Animal Science, Volume 97, Issue Supplement_2, July 2019, Pages 67–68. (Abstr.). Link to abstract.

Kwon Woong B., Kevin J. Touchette, Aude Simongiovanni, Kostas Syriopoulos, Anna Wessels, Hans H. Stein. 2019. Effects of dietary leucine concentration on branched-chain amino acid metabolism in growing pigs. Journal of Animal Science, Volume 97, Issue Supplement_2, July 2019, Pages 65–66. (Abstr.). Link to abstract.

Lee, Su A, L. Vanessa Lagos, Carrie L. Walk, and Hans H. Stein. 2019. Standardized total tract digestibility of calcium varies among sources of calcium carbonate, but not among sources of dicalcium phosphate, but microbial phytase increases calcium digestibility in calcium carbonate. J. Anim. Sci. 2019.97:3440–3450.

Kwon, W. B., and H. H. Stein. 2019. Excess leucine reduces nitrogen retention, growth performance in pigs. July 29, 2019. Link to ful text.

Soybean meal (SBM) is one of the most important protein sources in swine diets. However, most P in SBM is bound to phytate, which increases inclusion of inorganic P in diets for pigs. Use of microbial phytase may hydrolyze phytate and subsequently improve P absorption. Fermex 200 (Purina Animal Nutrition, Shoreview, MN, USA) is a new source of fermented SBM that may serve as an alternative to other protein sources in diets fed to pigs. However, there are at this point no data for effects of adding phytase to diets containing Fermex 200 and no data for digestible energy (DE) and metabolizable energy (ME) concentrations of Fermex 200.

Therefore, 2 experiments were conducted to test the hypothesis that inclusion of 1,000 phytase units (FTU)/kg of microbial phytase improves the standardized total tract digestibility (STTD) of P in conventional SBM and Fermex 200. The second hypothesis was that the STTD of P, as well as concentrations of DE and ME in Fermex 200 are greater than in conventional SBM.

Values for digestibility of nutrients in diets or feed ingredients fed to pigs are determined by nutrient intake and nutrient excretion in feces or ileal digesta. Ileal nutrient digestibility is determined using an indigestible marker because complete quantitative collection of ileal digesta is usually not possible. As a consequence, analysis of marker concentration in digesta is critical for accurate calculation of digestibility coefficients. Therefore, a sufficient adaptation period before initiation of ileal digesta collection is also important to make sure that the concentration of the marker in digesta is constant. It is, however, not known if the adaptation period is different among different markers. Therefore, an experiment was conducted to test the hypothesis that adaptation is needed to have constant marker concentrations in ileal digesta from pigs. The second objective was to test the null-hypothesis that apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of AA digestibility and the basal endogenous losses of AA are constant regardless of the indigestible marker used.

Curry Shelby M., Laia Blavi, Julian Wiseman, and Hans H. Stein. 2019. Effects of distillers dried grains with solubles on amino acid digestibility, growth performance, and carcass characteristics of growing pigs. Transl. Anim. Sci. 2019.3:641–653. Link to full text

Espinosa Charmaine D., Su A. Lee, and Hans H. Stein. 2019. Digestibility of amino acids, energy, acid hydrolyzed ether extract, and neutral detergent fiber, and concentration of digestible and metabolizable energy in low-oil distillers dried grains with solubles fed to growing pigs. Transl. Anim. Sci. 2019.3:662–675. Link to full text

Lagos L. Vanessa, Su A. Lee, Guillermo Fondevila, Carrie L. Walk, Michael R. Murphy, Juan J. Loor and Hans H. Stein. 2019. Influence of the concentration of dietary digestible calcium on growth performance, bone mineralization, plasma calcium, and abundance of genes involved in intestinal absorption of calcium in pigs from 11 to 22 kg fed diets with different concentrations of digestible phosphorus. Journal of Animal Science and Biotechnology. 2019. 10:47.