The Shape of the Claw is Maintained by the Turnover

Excessive growth of cow's claw is said the result of grow up the claw more than wear-out. On the other point of view, like the epidermal it moves to the horny layer on the surface as the keratinocyte generated with the basal layer that exists most in deep, and the claw also does the turnover that becomes dirt and flakes off at the end.
However, horn of the wall of the claw doesn’t involve turnover while the sole of the claw thins the thickness of the sole by the turnover. The excessive wall of the claw loses the support of the sole of the claw, and then it wears out by breaking little by little.
However, the floor in cow's kept cowshed is high moisture, and the hoof has received strong pressure from concrete. It is a severe environment for the claw to do the turnover. Especially, the hind lateral claw is hard to do the turnover because of liking to receive strong pressure. Therefore, it is easy to put excessive growth because a decrease of the thickness of the claw is only by wear-out ...