I sure hope someone has some ideas, to this query. My best 10 yr. old cow, due middle of March, weighs about 1600 lbs. Good condition, eats everything that won't eat her first. can hardly walk,she is lame on her back end. I have had her on Bute tablets for a few months. I can't find anything in her feet, not foot rot, no swelling in the legs or feet. last winter while pregnant, she was lame in one back leg, she got over it after the calf was a few days old. Hopefully she will again. I just am trying to figure out her problem. The bute helps alittle but not much. I appreciate any input. Thankx