Relation between some folate-dependent metabolic pathways and dietary folate content in chicks

Area of Science:

• Animal Nutrition
• Biochemistry
• Nutritional Physiology

Background:

• Folate is essential for numerous metabolic processes.
• Understanding folate metabolism is crucial for optimizing animal health and productivity.
• Specific biochemical markers are needed to assess folate status in poultry.

Purpose of the Study:

• To investigate the impact of dietary folic acid on folate-metabolizing pathways in young chicks.
• To identify reliable biochemical criteria for evaluating folate nutritional status in chicks.

Main Methods:

• Chicks were fed varying levels of dietary folic acid.
• Histidine load oxidation to carbon dioxide was measured.
• Activities of hepatic glutamic acid formiminotransferase and glycine N-methyltransferase were assessed.
• Erythrocyte dihydrofolate reductase activity was determined.

Main Results:

• Folate deficiency impaired the oxidation of histidine to carbon dioxide in chicks.
• A dose-dependent, curvilinear relationship was observed between dietary folate and histidine oxidation, with optimal levels at 2 mg/kg.
• Hepatic enzyme activities (glutamic acid formiminotransferase, glycine N-methyltransferase) were not significantly affected by dietary folic acid.
• Erythrocyte dihydrofolate reductase activity increased in folate-deficient chicks.

Conclusions:

• Histidine oxidation and erythrocyte dihydrofolate reductase activity serve as sensitive biochemical indicators of folate status in chicks.
• These findings provide valuable tools for assessing and managing folate nutrition in poultry.