This breed is also not usually found in pet stores Number Eight and Nine is the American and the American Satin Guinea Pig. They are the most common breed of Guinea Pigs as well as one of the oldest close to Abyssinian. There hair is straight back and sleek.
Insert the meat thermometer into the thickest part of the roast and put the roast in the oven. Cook rump roast for at least 1 hour and 40 minutes for rare. Make sure that the internal temperature of the meat is at least 120 F before removing from the oven.
Meanwhile, place a rack in the bottom third of the oven and heat to 200F. Place the roast fat side up (so that it's resting on the bones) on a rack set in a roasting pan. Place in the preheated oven and roast until a thermometer reads 118F, about 5 to 6 hours (about 30 minutes per pound). When the internal temperature of the roast is at 118F, remove the pan from the oven onto a wire rack and cover it loosely with foil. Keep in a warm place for at least 30 minutes or up to one hour.