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.
Marinated Rump Roast. 1  1. Trim the roast of extra fat. 2  2. Place the roast in a large food storage bag. 3  3. Seal the bag and allow the meat to marinate for 5 hours or overnight.  4. When you're ready to cook the roast, preheat the oven to 325 degrees Fahrenheit (162 degrees 1  Celsius). 5. Place the roast in a dutch oven or roasting  pan.