What term is used to describe a cow weighing approximately 425 kg that consumes 9 kg of air-dry forage daily?

Explanation

An 'Animal unit' refers to a standard measurement representing an animal, typically a cow weighing around 425 kg and eating about 9 kg of air-dry forage each day. Other options such as 'livestock group' or 'average herd' do not specifically define this standard unit.