Reliable behavioral signs of sexual receptivity are display of cooperative postures and standing while mounted. Shaking is commonly performed after dust-bathing, rolling on the ground, or when the coat becomes wet. If performed excessively, sham chewing may be accompanied by hypersalivation. Sham chewing occurs most frequently in confined pigs feed a highly concentrated diet and is considered to be a vacuum activity S16414. Sham dust bathing is considered to be a vacuum activity.
Sham rumination is a vacuum activity manifested by ruminants whose diet is lacking in roughage.
Shivering also can be a reaction to extreme fear or excitement S16505. The act of causing or the state of experiencing a sudden and extreme physical, physiological, or psychological disturbance resulting in partial or complete incapacitation. A dressage maneuver in which the horse moves forward, with its body slightly bent around the right leg of the rider. The horse's head should point to the right of the direction of movement. A tongue deformity that causes feeding difficulty.