Which of the following is NOT a common method of storing feed?

The correct answer is ocean containers because they are not a common method of storing feed for agricultural purposes. Typically, ocean containers are designed for transporting goods across seas and are not primarily used for long-term storage of feed in farming operations.

In contrast, bunkers, silos, and tarps are widely utilized in the agricultural industry for feed storage. Bunkers provide a controlled environment for bulk feed storage, helping to minimize spoilage and maintain feed quality. Silos are specially designed structures that allow for vertical storage of feed, which also helps with preservation by limiting exposure to air and moisture. Tarps offer a flexible option for covering feed piles to protect against weather elements, although they are not as robust as silos and bunkers.

Thus, ocean containers stand out as an atypical choice for feed storage compared to the other options mentioned.