We have a 3 year old Brangus cow that had her first calf in late Feb. She had been in great shape and is an easy keeper. All other cattle in the same pasture still look great. Last week we noticed her off to herself in obvious discomfort. She moves slow, and while standing still, extends her back leg and will shake it. This appears to be due to discomfort. She does this with both back legs. Our initial thought was some type of electrolyte problem. We put her in lot, gave IV with electrolytes, and minerals including mag and calcium. We also took the big calf off of her. We are about 1 week into this and don't really see any improvement. She spends most of her time laying down, but is still eating and drinking some. Are there any other ideas or suggestions. Thanks.