Lee, Su A and H. H. Stein. 2021. Ca and P digestibility values aren’t accurate for formulating sow diets. Pork Magazine, On-line edition, Sep. 9, 2021. Link to full text.

Corn coproducts produced from the fuel ethanol or the wet milling industries may be used in diets for pigs. Different technologies are used to develop high protein corn co-products, but in addition to providing amino acids to the diets, high protein corn co-products also provide energy to the diets. The energy concentrations in corn protein may depend on the concentrations of fat, carbohydrates, and protein in sources of corn protein. Newly developed corn proteins contain 40 to 50% crude protein. There are, however, limited data on how differences in the chemical composition of different sources of corn protein influence the concentrations of digestible energy (DE) and metabolizable energy (ME) when fed to weanling pigs. Therefore, the objective of this experiment was to test the null hypothesis that there is no difference in the apparent total tract digestibility (ATTD) of gross energy (GE) and concentrations of DE and ME among 3 sources of corn protein when fed to weanling pigs.

Rodriguez, Diego A.,  Su A Lee, and Hans H. Stein. 2021. Growth performance and carcass quality are not different between pigs fed diets containing cold-fermented low-oil DDGS and pigs fed conventional DDGS, but pelleting improves gain to feed ratio regardless of source of DDGS. Journal of Animal Science, 2021, Vol. 99, No. 8, 1–8. doi:10.1093/jas/skab129.

Corn coproducts produced from the fuel ethanol or the wet milling industries may be used in diets fed to pigs. Newly developed corn proteins are high protein feed ingredients with approximately 40 to 50% crude protein (CP), and corn protein may be a great source of digestible amino acids (AA) in diets fed to weanling pigs. There are, however, limited data on the digestibility of AA in different sources of corn protein fed to weanling pigs. Therefore, the objective of this experiment was to test the null hypothesis that there is no difference in the standardized ileal digestibility (SID) of AA in 3 different sources of corn protein when fed to weanling pigs.

Lee, Su A, L. Vanessa Lagos, Mike R. Bedford, and Hans H. Stein. 2021. Quantities of ash, Ca, and P in metacarpals, metatarsals, and tibia are better correlated with total body bone ash in growing pigs than ash, Ca, and P in other bones. Journal of Animal Science, 2021, Vol. 99, No. 6, 1–6. doi:10.1093/jas/skab149.

Ibagon, J. A. S. A. Lee, and H. H. Stein. 2021. Ileal Digestibility of Amino Acids Is Greater in Sunflower Expellers Than in Sunflower Meal When Fed to Growing Pigs. J. Anim. Sci. 99(Suppl. 1): 86–87. doi.org/10.1093/jas/skab054.140. Link to Abstract.

Lagos, L. Vanessa, Su A Lee, Mike R. Bedford, and Hans H. Stein. 2021. Formulating diets based on digestible calcium instead of total calcium does not affect growth performance or carcass characteristics, but microbial phytase ameliorates bone resorption caused by low calcium in diets fed to pigs from 11 to 130 kg. Journal of Animal Science, 2021, Vol. 99, No. 3, 1–11. doi:10.1093/jas/skab057.

Soybean meal (SBM) is the major source of amino acids in diets for swine throughout the world. However, in addition to providing indispensable amino acids to diets, SBM also provides energy to the diets. Diets are often formulated based on the net energy (NE) in each individual ingredient using a linear programming computer software. Therefore, the NE for each ingredient is important for the value the ingredient is assigned in the formulation. However, the NE for SBM that is used by most feed formulators was generated many years ago, but results of recent research indicate that current U.S. SBM may provide more NE than previously estimated, which potentially results in an increased estimation of the value of SBM in diets for pigs. There is, therefore, a need for confirming or updating the NE value for SBM. As a consequence, the objective of this experiment was to test the hypothesis that the NE in U.S. SBM fed to modern genotypes of pigs is greater than the value that is currently used in feed formulation.

Acosta Medellin, Jessica P., Su A Lee, Hans H. Stein. 2020. Ileal digestibility of amino acids in a new source of high-protein distillers dried grains with solubles fed to growing pigs. J. Anim. Sci. 98(Suppl. 3): 148. doi.org/10.1093/jas/skaa054.260. (Abstr.). Link to abstract.