In what part of cattle's body is a brass tag often placed for identification?

A brass tag is commonly placed in the ear of cattle for identification purposes. This method of identification is widely used in livestock management because the ear is easily accessible and visible, allowing for quick identification by farmers and veterinarians. Additionally, the ear provides enough space to securely affix the tag without causing discomfort to the animal, which is important for both animal welfare and the effectiveness of the tagging system.

Other parts of the body, such as the neck or rump, might not be as practical for tagging due to potential mobility or accessibility issues, and placing a tag on the wrist is not typically done because it is not a suitable location for easy visibility or security.