I pulled a calf from a heifer 4 days ago and had the heifer and calf penned with another pair, the heifer seemed to like to chase the other calf and headbutt it so I separated the pairs. Now I have more to calve so I kicked her and her calf out and she's still head butting and chasing but not near as bad. Also she still has her tail out like she is going to calve with some a small string of blood from her vulva. Is this normal in heifers? I haven't seen it before so maybe I've been lucky.