You mean Genesis the cow? Was it renamed Elsie?
The cow tends to show up and leave periodically, I'm sure it keeps breaking and they have to pull it out, fix it, and put it back in multiple times a year. It and the ducks are two more little things that make the park special, but at the same time are constantly in some state of maintainence. When the ducks are set up, they're constantly getting stuck and people spend most of their time just trying to clear the duck jams.