Different cows show different heat signs depending on their age, breed, and health condition. Some cows clearly stand to be mounted, which is the most reliable sign of heat, while others show mild or silent signs. Common signs include restlessness, frequent bellowing, swollen and reddened vulva, and clear mucus discharge. Certain cows may eat less, produce less milk, or attempt to mount other cows. Because heat signs vary from one cow to another, careful observation is important for proper breed