What are the key features of intensive rearing?

A mnemonic can be used for such questions which ask for 4/5 points. With intensive rearing for example: My Whale Does Yoga Sometimes. M - movement, W - warmth, D - diet, Y - young, S - selective breeding. From these short phrases, you can develop what role each of them plays. For example, movement is resticted so that the animal converts more energy from their food into body mass rather than it being wasted on cell respiration for muscle contraction.