2022
An Investigation of the Amino Acid Release Patterns as a Mechanism for the Superior Nitrogen Retention of Intact Soy Protein
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Contributor/Checkoff:
United Soybean Board
Category:
Feed
Keywords:
Amino acidsAnimal nutritionIntact proteinMacronutritional bundleSoy mealSustainabilitySwine
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Eric Weaver, South Dakota State University
Co-Principal Investigators:
Project Code:
2240-352-0514-P
Contributing Organization (Checkoff):
United Soybean Board
$70,992
Institution Funded:
South Dakota State University
$70,992
Brief Project Summary:
The amino acid requirements of pigs have been refined to standardized ileal (SID) or apparent total tract digestible values (ATTD) (NRC, 2012). However, disappearance of amino acids from intestinal content samples indicates digestion and absorption but does not address potential post-absorptive differences in utilization or assimilation by the animal. Protein sources differ in rate of digestion and the pattern of amino acid release. As the microbiome, intestine and liver may metabolize amino acids, the pattern and the timing of appearance in circulation may differ between soy protein, corn protein and synthetic amino acids. Since amino acids are not stored in the body, rapid absorption of an amino acid after a meal may also lead to greater catabolism of that amino acid, a fate that does not benefit synthesis of lean tissue. Previous research has shown that animals fed intact proteins from soy, at the same SID lysine levels, have an increase in nitrogen retention when compared to diets containing synthetic amino acids. A possible mechanism for greater nitrogen retention is that intact soy proteins provide a longer, more sustained release which allows for greater time for assimilati
Information And Results
Project Summary

Project Objectives

Project Deliverables

Progress Of Work

Final Project Results

The diets in this study utilized two of the most common protein feedstuffs used in swine diets and the diets were formulated to the same SID lysine level and comparable protein concentrations. The more efficient use of intact protein from soy or corn for protein retention indicates that valuing synthetic amino acids according to the SID coefficient does not lead to the desired outcome of equivalent nitrogen retention in the pig. Also, the 30% reduction in nitrogen output of pigs fed soy protein when compared to corn protein has significant implications to the valuation of soy relative to corn protein for sustainability initiatives.

Benefit To Soybean Farmers

This project is likely to be a base study that leads to significantly more soy protein being fed to pigs in the future.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.