Turn the aerator housing counterclockwise and remove it from the faucet. Pull the O-ring off the tip of the faucet spout with your finger. The O-ring prevents leaking between the housing and the faucet. Set the O-ring in a safe place until you are ready to reinstall the housing.
After that, they are referred to as yearlings or stirks if between one and two years of age. A castrated male is called a steer in the United States; older steers are often called bullocks in other parts of the world but in North America this term refers to a young bull.
A calf is a newborn bovine or dairy animal. A heifer is a young female that has not yet had a calf and begun to milk. A cow is a mature female bovine or dairy animal and a bull is a mature male bovine or dairy animal. Cows give milk for about ten months (or about 305 days) after having a calf. They stop milk production during a two-month dry period before giving birth and entering another ten-month milk cycle.