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.
The cooking time for a rump roast that weighs 2 to 4 pounds is 1 1/2 to two hours at 325 degrees Fahrenheit. To achieve medium-rare doneness, the roast should come out of the oven when a meat thermometer registers the internal temperature at 135 degrees Fahrenheit.