1. Free feeding: Allow animals to choose and eat freely, such as providing sufficient forage or feed when feeding herbivores.
2. Quantitative feeding: according to the needs of animals, give a certain amount of food, such as a fixed amount of food or feed every day.
3. Feed mixing: different kinds of feed are mixed to meet the various nutritional needs of animals.
4. Breastfeeding: The mother animal provides milk or milk powder as the main food for the cubs, and feeds them before the cubs can eat independently.
5. Forced feeding: artificially pouring food into the stomach of animals, often used to treat diseases or restore health.
6. Infusion feeding: provide nutrition and water to animals through intravenous or subcutaneous injection.
7. Open feeding: Keep animals in suitable places and let them get food through natural feeding and foraging.