Signs of estrus are numerous, some obvious, some more discreet. The doe usually flags her tail side-to-side when around a buck, presumably to send attractive pheromones from her reproductive tract into the environment that a buck finds attractive. Her vulva may be more pink than normal, appear swollen, and have some clear or white-colored discharge with the consistency of egg white. This discharge usually starts clear and becomes whiter as the heat progresses. Others signs include more frequent urination and restless behavior. She may also talk more than usual, sometimes bleating very loudly at the edge of the fence line nearest the buck. Decreased appetite and milk production are also reported. The doe is in a standing heat when she stands willingly and lets a buck mount. Standing heat usually lasts from 1-24 hours. If a buck is not present, does often mount their herd mates or stand for other does to mount them.