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Related Experiment Videos

Fat and carbohydrate use in posthatch chicks.

D Sklan1

  • 1Faculty of Agriculture, Hebrew University, Rehovot, Israel, 76-100. sklan@agri.huji.ac.il

Poultry Science
|February 13, 2003
PubMed
Summary

Newly hatched chicks utilize yolk lipids rapidly, but glucose uptake increases post-hatch. This shift in energy metabolism supports chick development as yolk reserves diminish.

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Area of Science:

  • * Avian physiology
  • * Nutritional biochemistry
  • * Metabolic adaptation

Background:

  • * Hatching chicks rely on yolk lipids for energy.
  • * Understanding the transition to post-hatch nutrient utilization is crucial for avian development.

Purpose of the Study:

  • * To investigate the metabolism of carbohydrates and fats in newly hatched chicks.
  • * To determine how lipid and glucose utilization changes with age.

Main Methods:

  • * Introduction of 14C-labeled oleic acid, triolein, or glucose via gastrointestinal tract or yolk sac.
  • * Measurement of label in plasma and exhaled air over 12 hours.
  • * Calculation of rate constants for label appearance and disappearance.

Main Results:

  • * Yolk sac lipid administration showed rapid circulation and utilization.
  • * Gastrointestinal lipid absorption rate was constant, but plasma clearance increased with age.
  • * Glucose circulation increased post-hatch, while its clearance rate remained unchanged.

Conclusions:

  • * Maternal or yolk lipoproteins facilitate lipid transport at hatch, decreasing post-hatch.
  • * Increased glucose uptake post-hatch establishes it as a primary energy source.
  • * Metabolic adaptation shifts from yolk lipids to dietary glucose for energy as chicks grow.

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