Topics:
Animal Nutrition, Animal Refresher
Collection in Digestibility Trials
In Digestibility trial, which is/are used & collected for estimation:
- Urine
- Faeces — Correct Answer
- Both
- None
Explanation:
Correct Answer: Faeces
In a digestibility trial, only faeces are collected and used for estimating the digestibility of feed nutrients. Urine is not collected because digestibility measures nutrient absorption from the gut, not post-absorptive metabolism.
Digestibility Trial vs. Metabolic Trial
| Trial Type | What is Collected | Purpose |
|---|---|---|
| Digestibility trial | Faeces only | Measures apparent digestibility of nutrients |
| Metabolic trial | Faeces + Urine | Measures nitrogen balance, energy balance |
Digestibility Trial — Key Details
- Preliminary period: 10–12 days (ruminants); 7–10 days (horse/swine)
- Collection period: 7–10 days for all species
- Preferred animals: Castrated males (faeces and urine collected separately)
- In poultry: digestibility determined surgically or chemically (cloaca issue)
Why Other Options Are Wrong
- Urine → collected in metabolic trial, not digestibility trial; urinary losses reflect post-absorptive metabolism
- Both → this describes metabolic trial collection, not digestibility trial
- None → incorrect; faeces are specifically collected in digestibility trials
📚 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.
