Concept:Animal production is the branch of agriculture that involves the management and care of livestock for useful purposes.
Explanation:Animal production covers all activities related to keeping farm animals.
It includes feeding, housing, health care, breeding, and general welfare of livestock.
Livestock may be raised for food, work, fibre, skin, or other agricultural benefits.
Option A gives the widest and most correct definition.
Option B is only one part of animal production, not the whole practice.
Option C lists outputs of animal production but ignores the care and management involved.
Option D is about growing crops for animals, which is crop production, not animal production.
Therefore, animal production is best defined as the management and care of livestock for various purposes.
Answer:A. The management and care of livestock for various purposes.