Site pages
Current course
Participants
General
Topic 1
Topic 2
Topic 3
Topic 4
Topic 5
Topic 6
Topic 7
Topic 8
Topic 9
Topic 10
Topic 11
Topic 12
Topic 13
Topic 14
Topic 15
Topic 16
Topic 17
Topic 18
Topic 19
Topic 20
Topic 21
Topic 22
Topic 23
Topic 24
Topic 25
Topic 26
8.4.Forms of energy partitioning
Unit 8 - Energy
8.4.Forms of energy partitioning
- Gross energy (E) is the energy that is released as heat when a substance is completely oxized to carbon dioxide, nitrous oxide or water.
- Intake energy (IE) is gross energy consumed by an animal in its food. The majority of intake energy is in the form carbohydrate, protein or lipid.
- Faecal energy (FE) is the gross energy of the faeces. Faeces consists of undigested food and metabolic products, which may include sloughed gut epithelial cells, digestive enzymes and secretory products.
- Digeted energy (DE) refers to apparently digested energy with in a food and is determined as the energy in food minus the energy in faeces (DE=IE-FE).
- Urinary energy (UE) is gross total energy in urinary products.
- Gill excretion energy (ZE) is the gross energy of the compounds excreted through the gills.
- Surface energy (SE) is the energy lost from the surface of fish i.e. mucus or scales sloughed off from the fish.
- Metabolizable energy (ME) is the energy in the food minus the energy lost in faeces, urine and through gill excretion {ME=IE-(FE+UE+ZE)}. It is energy available for the conduct of the metabolic processes.
- Total heat production energy (HE) is the energy lost from the animal in the form of heat. The heat is produced as a result of metabolism and so HE is a measure of metabolic rate in fish.
Last modified: Friday, 24 June 2011, 10:25 AM