Which breed of pig is characterized by having erect ears and is referred to as the “mother breed”?

The Yorkshire breed of pig is recognized for its erect ears and is often referred to as the "mother breed" due to several key characteristics that make it an excellent choice for breeding. Yorkshire sows are known for their high fertility rates, excellent maternal instincts, and capability to produce large litters. These traits are essential in a breeding program for commercial pork production, where maternal ability plays a critical role in the success of pig farming.

Additionally, the Yorkshire breed has a reputation for good health and adaptability, making them a popular choice among farmers. Their erection of ears is another distinct feature that sets them apart from other breeds, aiding in their identification and classification within the swine industry. The combination of maternal qualities and physical characteristics solidifies the Yorkshire's status as the "mother breed," leading to its prominent role in breeding programs and its influence on the overall improvement of swine production.