Male Wistar rats were obtained from the breeding colony of the National Veterinary Research Institute (NVRI) in Jos, Nigeria. The animals were kept in the animal holding facility of the Department of Anatomy, Bingham University Nasarawa, Nigeria. They were given standard rat pellets and water available ad libitum and were allowed to acclimatize for two weeks. They were kept in aerated cages under standard laboratory conditions of 12 h light/dark cycle (lights on at 0800 h), average room temperature (22 ± 2 ◦C; relative humidity, 50–60%).