Which of the following is not an example of permanent identification?

The answer indicates that ear tags are not considered a form of permanent identification. While ear tags are commonly used to identify livestock, they are generally not permanent because they can be lost or removed. In contrast, tattoos, branding, and ear notching are considered permanent methods of identification.

Tattoos involve ink or dye being injected into the skin, making them relatively permanent as they usually remain throughout the animal's life. Branding involves marking the skin with a hot or cold instrument, creating a lasting mark. Ear notching, a method where small pieces of the ear are excised to create specific patterns or identifiers, also provides a permanent form of identification as the notches do not heal over time like a tag might be removed.

Understanding the characteristics of each identification method helps in recognizing the reliability and longevity of each type of identification used in livestock management.