Amino acid utilization by the hindlimb of warmblood horses at rest and following low intensity exercise.

The study focuses on the absorption of amino acids by a horse’s hindlimb both before and after low-intensity exercise. The research found that the amino acids citrulline, cystine, serine, and leucine were absorbed the most, with no sigificant change after exercise.

Research Objective and Methodology

• The research was aimed at studying the use of amino acids by horses’ hindlimbs while at rest and after light exercise
• The study was conducted using a method called the arteriovenous difference technique to examine the uptake of amino acids by the hindlimb
• The subjects were six warmblood mares, with an average age of 12 ± 3 (SD) years and average weight of 538 ± 39 kg
• The horses were fasted for 12 hours before the exercise, which consisted of a 5-minute walk, a 20-minute trot, and a concluding 5-minute walk

Method of Amino Acid Determination and Statistical Analysis

• Amino acids in the horses’ blood samples were quantitatively analyzed using anion exchange chromatography
• Results were processed statistically using a general linear mixed model

Research Findings

• The amino acids which exhibited the highest average extraction at rest were citrulline, cystine, serine, and leucine
• Among the 25 different varieties of amino acids investigated in the study, none showed significant changes after exercise
• The blood plasma concentrations were found highest for glycine, glutamine, valine, and serine
• The average extraction for α-aminobutyric acid at rest was 18.2 ± 26%
• The arterial plasma concentration of citrulline was found to be higher than in venous plasma

Conclusions

• The study concluded that citrulline, cystine, serine, and leucine were the most important amino acids absorbed at rest in warmblood mares
• The research calls for further study of leucine and its possible role in preserving or restoring body protein in horses