Topics:
Animal Nutrition, Animal Refresher
Phosphorus Excretion in Carnivores
Main route of phosphorus excretion in carnivores is:
- Faeces
- Urine — Correct Answer
- Sweat
- None
Explanation:
Correct Answer: Urine
In carnivores, the primary route of phosphorus excretion is via urine, unlike herbivores and ruminants where faeces is the main route. This is because carnivores have a high protein/phosphorus diet and their kidneys efficiently filter and excrete inorganic phosphate.
Phosphorus Excretion by Species
| Species Type | Primary P Excretion Route |
|---|---|
| Herbivores/Ruminants | Faeces (via bile & intestinal secretion) |
| Carnivores (dog, cat) | Urine |
| Omnivores (pig, human) | Faeces (primarily) |
Why This Difference Exists
- Carnivore diets are rich in animal protein → high phosphorus intake → excreted renally.
- Ruminants recycle P heavily through saliva and re-absorb it in the intestine → mainly faecal loss.
- Renal threshold for phosphate is lower in carnivores → more urinary excretion.
Why Other Options Are Wrong
- Faeces → correct for herbivores/ruminants, not carnivores.
- Sweat → negligible route for P excretion in any species.
- None → urine is the definitive answer for carnivores.
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
