For sheep and goats, which of the following is the most common method used for identification?

Ear tagging is the most common method of identification for sheep and goats due to its practicality and effectiveness. This method involves the insertion of a tag into the ear of the animal, which contains unique identification information such as numbers and sometimes additional data related to the animal's health or breeding history.

One reason ear tagging is favored is that it allows for quick and easy identification, particularly useful in larger herds where animals must be tracked frequently. Tags are highly visible and can be designed to withstand weather conditions, ensuring durability over time. Ear tags can also provide a cost-effective solution for many producers, allowing them to maintain accurate records without the need for more invasive procedures.

In contrast, while microchipping can be a reliable form of identification due to its permanence, it is not commonly used for sheep and goats because it requires special equipment for scanning and can be more costly. Tattooing, while still utilized, is less visible and may not be as easily readable at a glance, leading to potential identification delays. Collar marking, while sometimes used, does not offer the same level of permanence and can be prone to loss as collars can be removed or fall off. Thus, ear tagging remains the go-to method for identifying sheep and goats effectively.