ICAR AICE-JRF/SRF Principles of Animal Nutrition & Feed Technology: practice questions

1 · Energy partition: GE, DE, ME and NE · hard

When digestibility of a concentrate is measured 'by difference' with a hay basal diet, the main source of error is:

1. Incomplete recovery of the chromic oxide marker, which inflates the calculated daily faecal output
2. Associative effects changing the digestibility of the basal hay when concentrate is added
3. The metabolic faecal fraction of the concentrate
4. Loss of nitrogen from faeces during drying

2 · Measures of protein quality: BV, NPU, CP and DCP · medium

A rat eats 16 g N over a trial; faecal N is 4 g and urinary N 4 g. Net protein utilisation (apparent) is:

1. 66.7%
2. 75.0%
3. 33.3%
4. 50.0%

3 · Rumen-degradable and undegradable protein · hard

Excessive heating of a protein supplement to make it 'bypass' is harmful mainly because:

1. Maillard reaction makes lysine and other amino acids unavailable in the intestine too
2. It converts protein into urea
3. It increases the rumen degradability of the protein, so less reaches the small intestine
4. It destroys the sulphur content of the feed

4 · Vitamins · hard

Pantothenic acid deficiency in pigs is classically associated with:

1. Black tongue
2. Curled toes
3. Star-gazing
4. Goose-stepping gait

5 · Feed additives · easy

The European Union banned antibiotic growth promoters in animal feed with effect from:

1. 1 January 2016
2. 1 January 2022
3. 1 January 2006
4. 1 January 1996

6 · Principles of feed formulation · hard

Why do different feeding standards (for example ICAR, NRC/NASEM, INRA) give different requirement figures for animals of similar weight and yield?

1. They use different energy and protein units, experimental data, breeds and safety margins
2. Requirements do not vary between breeds or climates, so the figures differ only by rounding
3. They measure body weight in different units
4. Only one of them is based on experiments