Absorptioin and excretion

ABSORPTION AND EXCRETION

Absorption  

  • Absorption of glucose occurs via both passive and carrier mediated transport system.
  • Passive transport appears to predominate in the duodenum and jejunum. Chicken has a sodium dependent carrier system for the active transport of sugars.
  • Carrier medicated transport of D -glucose is facilitated by a Na+-glucose co-transpoter protein.
  • Amino acids are also transported by Na+ dependent and energy dependent carrier mediated process in birds.
  • Four system of amino acids tansport have been identified in chicks:
    • Neutral amino acids system
    • Basic amino acids system
    • Acid amino acids system
    • A system for proline, beta  alanine and related amino acids.
  • Neutral amino acids are transported more rapidly than basic or acidic amino acids.

Faeces

  • This material consisting of waste and undigested food mixed with the urine in the cloaca and eliminated from the body as faeces.
  • Typically it is a rounded, brown to grey mass topped with a cap of white uric acid from the kidneys. 
Last modified: Saturday, 4 June 2011, 9:21 AM