Glutamine in animal science and production

Area of Science:

• Animal Nutrition and Metabolism
• Ruminant Physiology
• Immunology

Background:

• Glutamine has proposed metabolic roles in animal production and disease, particularly in nucleic acid biosynthesis and hepatic amino acid oxidation.
• Supplementation responses in ruminants (growth, lactation) and pigs/ruminants (digestive disorders) have been inconsistent.
• Glutamine is crucial for lymphocyte proliferation and metabolic acidosis control, with extra-hepatic production in sheep.

Purpose of the Study:

• To evaluate the efficacy of glutamine supplementation in animal production and health.
• To investigate glutamine's role in metabolic acidosis and immune responses.
• To understand if glutamine availability limits responses during adverse challenges.

Main Methods:

• Review of existing studies on glutamine supplementation in ruminants and pigs.
• Analysis of glutamine's metabolic roles, including amino acid oxidation and immune cell function.
• Examination of glutamine flux and concentration changes during endotoxin challenge in sheep.

Main Results:

• Inconsistent positive and null effects of glutamine supplementation on production in ruminants.
• Variable therapeutic responses in digestive tract disorders in pigs and ruminants.
• Endotoxin challenge in sheep decreased plasma glutamine but increased lymphocyte glutamate and protein synthesis, unaffected by glutamine-containing supplements.

Conclusions:

• Glutamine supplementation does not consistently provide beneficial or therapeutic effects, except in specific catabolic situations.
• Glutamine availability is likely not limiting in many challenge scenarios.
• Glutamine may act as a signaling molecule for nutrient demands, requiring further study for targeted applications.