Which swine breed is white with erect ears and is the most common and prolific swine breed?

The Yorkshire breed is characterized by its white color and erect ears, which are distinct features that help identify it among other swine breeds. It is known for its high level of productivity, making it one of the most prolific breeds in the swine industry. Yorkshires are favored for their ability to produce large litters and are often considered ideal for commercial crossbreeding due to their maternal qualities. Their adaptability and strong growth rate further contribute to their popularity among farmers.

In contrast, other breeds mentioned have different characteristics. For instance, the Landrace breed also has a white coat but has drooping ears, distinguishing it from the Yorkshire. The Duroc breed is typically reddish-brown and known for its meat quality, while the Berkshire breed has a black color with white points on the legs and face, and it is specifically bred for pork quality rather than prolificacy. Thus, the Yorkshire's combination of appearance and reproductive capability makes it the most common and prolific swine breed overall.