Chicken, turkey or hen raw material shall come from animals that have been transported to slaughter for no more than eight hours, including loading and unloading. When transporting animals during the hours of darkness, chickens, turkeys and hens shall have been transported to slaughter for no more than 12 hours, including loading and unloading. For transports of more than eight hours during the hours of darkness, the vehicle shall also have equipment that allows the ventilation and temperature to be adjusted to both internal and external temperatures.