What is the main source of butter?

The main source of butter is cows, specifically from the milk they produce. Butter is made through the process of churning cream, which is a component of milk. Cows are the most common livestock associated with dairy production, providing the milk needed to create cream, which is then processed into butter.

While other animals produce milk, such as goats and sheep, the predominant source for commercial butter is cow's milk. This widespread reliance on cows in dairy farming makes it clear that among the options given, cows are the primary source of butter. Other animals listed, such as pigs and chickens, do not produce milk suitable for butter production; pigs are typically associated with meat, while chickens produce eggs. Wheat serves as a grain used in baking and cooking but is not a source for butter.