Glucose homeostasis in the chicken

Area of Science:

• Animal Physiology
• Nutritional Biochemistry
• Metabolic Regulation

Background:

• Understanding glucose metabolism is vital for avian health and nutrition.
• The role of the intestine in glucose homeostasis requires further elucidation.
• Dietary energy sources impact metabolic pathways in growing animals.

Purpose of the Study:

• To investigate the impact of different dietary energy sources on glucose metabolism in chicks.
• To quantify the conversion of glucose to lactate in the chick intestine.
• To assess the intestine's contribution to glucose homeostasis.

Main Methods:

• Chicks were fed isocaloric diets supplemented with glucose, fructose, or soybean oil.
• Plasma glucose levels and body weight gain were monitored.
• Radioactive glucose was introduced into a duodenal loop to study in vivo conversion to lactate.
• Labeled metabolites were fractionated in duodenal and peripheral blood plasma.

Main Results:

• Dietary glucose or fructose did not significantly affect plasma glucose levels or body weight gain.
• Glucose turnover rate decreased in chicks fed carbohydrate-free diets compared to glucose-fed chicks.
• The intestinal wall converted up to 37% of absorbed glucose to lactate.
• Intestinal lactate production suggests a significant role in mitigating glucose fluctuations.

Conclusions:

• The chick intestine plays a critical role in glucose homeostasis by converting absorbed glucose to lactate.
• Intestinal glucose metabolism acts as a buffer, reducing postprandial hyperglycemia.
• This intestinal mechanism is essential for maintaining stable blood glucose levels in chicks.