Have a 5yr old tarentaise cross cow that is due to calve this spring, sometime in march or april. She acts as if she is sore on all of her feet. Moves very slow, puts her feet down very easy. Kinda like she is staved up. Eats fine, moves around with the other cows. Just slow. She got like this for awhile back in november and was fine after a couple days. Been like this for a while now, couple weeks any ideas???