Stein Nutrition Newsletter, November 2021
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            November 2021


Welcome to the Stein Monogastric Nutrition Newsletter. In this issue, you will find some of the work our Laboratory has produced and published in the last month. For more information, please visit our website at

In This Issue


Podcast: Effects of dietary valine, isoleucine, and tryptophan supplementations to diets containing excess leucine on nitrogen balance of growing pigs.

Dr. Woongbi Kwon, a Postdoctoral Research Associate from the Stein Monogastric Nutrition Lab, presents effects of dietary valine, isoleucine, and tryptophan supplementations to diets containing excess leucine on nitrogen balance of growing pigs. Adapted from a presentation at the 2021 ASAS Midwestern Section meeting, March 8-10.

(Watch or download...)


Press Release: How plant-based burgers stack up against meat burgers in protein quality.

URBANA, Ill. – Plant-based burgers often promise protein comparable to their animal-based counterparts, but the way protein is expressed on current nutrition labels – a single generic value expressed in grams – can be misleading. That’s because the human body does not use “protein” per se. Instead, it needs essential amino acids, which are present in proteins, but the concentration and digestibility of amino acids are different among protein sources.

(Read more...)


Research Report: Effects of phosphorus level and increasing phytase dose on basal endogenous loss of calcium and balance of phosphorus in pigs fed diets containing phytate P at commercial level.

In plant-based feed ingredients there is a considerable amount of P bound to phytate, limiting the amount of P that is available for utilization, but inclusion of microbial phytase in pig diets increases the digestibility of P. The negatively charged phytate molecule can chelate Ca cations resulting in formation of insoluble Ca-phytate complexes. Degradation of phytate by microbial phytase may prevent formation of these non-digestible complexes, resulting in increased Ca digestibility. It is also possible that use of exogenous phytase reduces endogenous loss of Ca. If indeed the reduced endogenous loss of Ca is a result of degradation of phytate, it is expected that increased doses of dietary phytase will linearly reduce endogenous losses of Ca, but this hypothesis has not been experimentally verified. Therefore, this experiment was conducted to test the hypothesis that increasing dietary phytase reduces basal endogenous loss of Ca and increases digestibility of P in growing pigs.

(Read more...)


Research Report: Effects of increasing dietary protein on standardized ileal digestibility of amino acids in soybean meal and soy protein concentrate fed to growing pigs.

Apparent ileal digestibility (AID) of crude protein (CP) and amino acids (AA) is affected by CP and AA concentrations in diets because of the different contributions of endogenous N and AA to the ileal digesta from pigs fed diets with different concentrations of CP. Because of the influence of dietary CP and AA on calculated values for AID, values for AID obtained in individual feed ingredients are not always additive in mixed diets if the concentration of CP and AA in the mixed diet is different from that of the ingredients. Therefore, values for standardized ileal digestibility (SID) of CP and AA, which are corrected for the basal ileal endogenous losses of CP and AA, are used in diet formulations to avoid the influence of endogenous AA on digestibility values, and SID values are, therefore, additive in mixed diets.

(Read more...)


New publications from the Stein Monogastric Nutrition Laboratory.

Peer-reviewed publications: 

Berg, Eric P., and Hans H. Stein. 2021. A Salute to PVT TIM HiLL: Indispensable Amino Acids and Global Human Health. Meat and Muscle Biology 2021.5(3): 4, 1–10. doi:10.22175/mmb.12925.


Espinosa, C. D., D. Velayudhan, Y. Dersjant-Li, J. Remus, H. H. Stein. 2021. Effect of phytase on mineral digestibility and growth performance of pigs fed diets with pharmacological levels of Zn. J. Anim. Sci. 99, (Suppl. S3): 400-401.

Blavi, L., D. Solà-Oriol, A. Monteiro, J. F. Perez, H. H. Stein. 2021. Comparison Between Copper Sulfate and Dicopper Oxide on Body Weight and Copper Accumulation on Growing Pigs.  J. Anim. Sci. 99, (Suppl. S3): 210-211.

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