It pays to know your cows! Today started out like any Friday. Get up, head for the day job, come home. I've been expecting Rowena to calve, so the first order of business is always to go look for her. Today there were other things to do first. While I was putting hay out, I looked up the hill, and there was rowena all by herself. She turned around, and from the looks of her tail at that distance, she'd had her calf. But there was no calf with her. When I finished with the hay, I went looking…