A method of promoting or improving the feed efficiency and the muscle to fat ratio in animals by administering to the animals a therapeutically effective amount of a pure or substantially pure RR-isomer of ractopamine is disclosed. The exercise device has a pair of equally sized rectangular mats including an upper and a lower mat having a hinge connection for folding in half. More specifically, the stator of the braking device comprises a spring which acts on a smooth surface of the rotor in a radial or tangential direction. The BCEECA subsystem provides amplified output signals. The method includes processing call arrival at the call router, performing intermediate processing with the state machine at the interactive voice response unit, and handling call departure procedures at the call router. In one embodiment, the method includes receiving an operating characteristic value, wherein the operating characteristic value indicates a value of an operating characteristic of a wagering game machine and based on a set of previous operating characteristic values of the operating characteristic, determining whether the operating characteristic value is within a normal operating range.