WAEC Agricultural Science 1991 (August) Question 39

Use the formula: percentage digestibility of nutrient = (Wt. of nutrient in feed − Wt. of nutrient in faeces)/Wt. of nutrient in feed × 100. If an animal ate 20 kg of feed containing 25% protein and excreted 15 kg of faeces containing 7.5% protein, what will be the digestibility of protein in the feed?

1. A.67.5%
2. B.77.5%
3. C.82.5%
4. D.87.5%
5. E.92.5%.