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Recap of the Dr. David H. Baker Symposium by Jacob A. Richert, Graduate Research Assistant, Purdue University, West Lafayette, Indiana

The Dr. David H. Baker Symposium on March 8, 2021 focused on the form and function of supplemental amino acids in swine nutrition. Seven speakers representing industry, veterinarians and academics spoke. A brief review of each talk is listed below.

Dr. Jaap van Milgen, PEGASE, INRAE, Institut Agro., began the symposium by discussing “Functional Role of Histidine in Diets of Young Pigs.” Jaap van Milgen discussed how histidine and histamine are important in the role of pH buffers, metal chelating agents, and antioxidants in skeletal muscle and the brain.  Histidine is more than a structural amino acid, and is mostly stored as carnosine, anserine, and balenine. When estimating the histidine requirement, we need to consider its structural and functional roles.

Christian D. Ramirez-Camba, South Dakota State University, continued with the discussion of “A Mechanistic Model of Growth and Amino Acid Deposition in the Pregnant Sow: Model Development, Evaluation, and Application”. Christian shared the model they developed to characterize weight gain and amino acid deposition in the pregnant sow. Based on testing, this model is a fair representation of growth, protein, and amino acid deposition for multiple parities.

Dr. So-Young Kim, CJ CheilJedang, spoke about “What Would Be the Next Feed Amino Acid Based on a Microbial Point of View”. Dr. Kim shared that most amino acids used for feed supplementation are produced via microbial production, but not all. Leucine, glutamine, tyrosine, and phenylalanine could be the next amino acids based on metabolic pathways of microorganisms; however, food grade amino acids could be used.

Dr. Woong Bi Kwon, University of Illinois, discussed “Effects of Dietary Valine, Isoleucine, and Tryptophan Supplementations to Diets Containing Excess Leucine from Corn Protein on Growth Performance of Growing Pigs”. Dr. Kwon shared an experiment performed on growing pigs to test whether additional Valine, Isoleucine, or Tryptophan could mitigate the negative effects of excess Leucine in the diet. Additional Valine and Tryptophan helped mitigate the negative response in excess Leucine diets.

Dr. Jesse Goff, Iowa State University College of Veterinary Medicine, continued the discussion of amino acids with “Mechanisms by Which Amino Acids May Enhance Mineral Absorption in Animals”. Dr. Goff presented how all macro and trace minerals face similar barriers to being absorbed into the bloodstream. Mineral absorption can be enhanced by amino acids; however, the mechanism is not yet understood. There appears to be multiple pathways worth investigating to absorb minerals.

Lucas Rodrigues, University of Saskatchewan, next spoke about “A Longer Adaptation Period to a Functional Amino Acid-supplemented Diet Improves Growth Performance and Attenuates Acute-phase Response in Salmonella Typhimurium-challenged Pigs”. Lucas shared an experiment to investigate the effect of adaptation period to a functional amino acid diet on growth performance and immune status during a Salmonella challenge. Overall data shows a longer adaptation period improves growth performance and immune status in an enteric challenge.

Dr. Karen J. Wedekind, Novus International Inc., wrapped up the Baker symposium with “Metal Amino Acid Chelate/complexes with Emphasis on Molecule Absorption and Efficacy Differences in Swine”. Dr. Wedekind presented on differences in molecular structures of organic and inorganic trace minerals as well as the impact of structure on stability, absorption, bioavailability, and retention.  Organic source matters, not all are equal. Organic trace minerals increase profitability.

The recording of the symposium will be available on the meeting website after the meeting.