Which swine breed is white with erect ears and was developed in Pennsylvania?

The Yorkshire breed is known for its distinctive white color and erect ears, characteristics that make it easily identifiable. This breed originated in England but was later developed and refined in the United States, including in Pennsylvania. The additional attributes that make Yorkshire pigs favorable in breeding include their high reproductive efficiency and excellent mothering ability, contributing to their popularity in the swine industry.

The other breeds listed have different traits and characteristics that set them apart. For instance, Hampshire pigs generally have a black body with a white belt around their shoulders, while Duroc pigs are reddish with drooping ears. Landrace pigs are known for their long bodies and drooping ears and are typically white but have different physical features and breeding background. Understanding these distinctions helps in recognizing the specific traits of each breed.