Lee, S. A, and H. H. Stein. 2022. Vitamin D and vitamin D metabolites impact on calcium and phosphorus balance in gestating sows. Proc. 21th Annual Midwest Swine Nutrition Conf. Danville, IN, Sep. 8, 2022. Pages 39-43. Link to full text.

SylPro enhanced torula yeast is a high protein feed ingredient derived from forestry by-products, and results from digestibility experiments indicate that SylPro yeast may be a great source of energy and digestible amino acids in diets fed to weanling pigs. Previous experiments further demonstrated that increasing levels of SylPro yeast resulted in increased feed efficiency of pigs, which is likely a result of a positive effect of SlyPro yeast on intestinal health and immune function of pigs. However, there are no data to demonstrate effects of SylPro yeast on the immune response of pigs. It is also not known if SylPro yeast influences pig performance and intestinal health similarly as conventional torula yeast. Therefore, an experiment was conducted to test the hypothesis that inclusion of SylPro yeast in diets fed to pigs improves growth performance and intestinal health. The second objective was to determine if there are differences between the two torula yeast sources in influencing growth performance and immune response of pigs.

Blavi, L., J. F. Pérez, A. Forouzandeh, N. E. Manzke, H. H. Stein, and I. R. Ipharraguerre. 2022. Effects of copper source on bile acid profiles and intestinal microbiota in finishing pigs. 15th International Symposium on Digestive Physiology of Pigs. Animal - Science Proceedings 13(Issue 2): 152. Link to abstract.

Lagos, V., M. Bedford, and H. H. Stein. 2022. Phytate breakdown, nutrient digestibility, plasma metabolites, and bone ash of pigs fed increasing phytase levels for a long adaptation period. 15th International Symposium on Digestive Physiology of Pigs. Animal - Science Proceedings 13(Issue 2): 174-175. Link to abstract.

Lee, Su A, D. A. Rodriguez, and H. H. Stein. 2022. Determination of the net energy in soybean meal fed to group-housed pigs. 15th International Symposium on Digestive Physiology of Pigs. Animal - Science Proceedings 13(Issue 2): 178. Link to abstract.

Market opportunities for field peas (Pisum sativum L.) have rapidly increased for livestock feed and human food, due of the high nutritional quality of pea protein. However, as is the case with some feed ingredients, differences in soil, varieties, agronomic practices and growing method may change the nutritional characteristics of the peas as well as digestibility of nutrients. In addition, it is possible that differences in the particle size of field peas change the digestibility of energy and nutrients as has been reported for other ingredients. However, information about the effects of particle size of peas on digestibility of starch and amino acids (AA) are limited. Additionally, there is limited research to compare the digestibility of AA among field peas produced in different regions of the U.S. and Canada. Therefore, the objective of this experiment was to test the hypothesis that the apparent ileal digestibility (AID) of crude protein and starch, and the standardized ileal digestibility (SID) of AA in field peas may be affected by the particle size of the field peas and the region where the field peas were grown.

Espinosa, C. D., D. Velayudhan, Y. Dersjant-Li, and H. H. Stein. 2022. Effect of Increasing Levels of a Novel Consensus Bacterial 6-Phytase Variant on Ileal and Total Tract Digestibility of Nutrients in Diets Fed to Young Pigs. J. Anim. Sci. 100(Suppl.2): 34–35. doi.org/10.1093/jas/skac064.056. Link to Abstr.

The effect of microbial phytase on Ca and P digestibility in diets for pigs and poultry is well established. In poultry, it also appears that the effect of phytase in increasing amino acid (AA) digestibility is consistent, but that is not the case when phytase is added to diets for pigs. However, in many experiments, relatively low levels of phytase was used and it is not known if greater concentrations of phytase will result in a different result. A novel phytase has been recently developed; however, it is also not known if this phytase source can increase digestibility of AA and other nutrients. Therefore, an experiment was conducted to test the hypothesis that inclusion of increasing levels of the novel phytase in diets for growing pigs increases the apparent ileal digestibility (AID) of crude protein (CP) and AA, and the apparent total tract digestibility (ATTD) of gross energy (GE) and minerals.

Kwon, Woong B., Jose A. Soto, and Hans H. Stein. 2022. Effects of dietary leucine and tryptophan on serotonin metabolism and growth performance of growing pigs. J. Anim. Sci. 100, 1–10. doi.org/10.1093/jas/skab356. Link to full text.