Which structure helps to maintain the shape and integrity of the hoof?

The bars are the structures that contribute significantly to maintaining the shape and integrity of the hoof. They are extensions of the hoof wall that run along each side of the frog and serve multiple purposes. Primarily, the bars provide strength and support to the hoof, enhancing its overall structure.

The design and connection of the bars to the hoof wall help to bear weight and absorb shock as the horse moves. This vital support is essential for preventing excessive distortion or collapse of the hoof shape during movement and impact, allowing for optimal performance and comfort in the horse. Through their structural function, bars also play a role in maintaining balance and promoting healthy hoof growth.

While the other options mentioned have important functions within the hoof's anatomy—such as the frog providing traction and aiding in shock absorption, the coronet band allowing for hoof growth, and the white line serving as the junction between the hoof wall and the sole—they do not play as direct a role in overall hoof shape and structural integrity as the bars do. Thus, the bars stand out as key in maintaining the hoof's form during the dynamic activities of a horse.