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 temperature and time also depends on the cut of the roast and if the bone is present. A standard rump roast is cooked at 325 degrees Fahrenheit for 20 minutes per pound, while a tenderloin roast is cooked at 425 degrees Fahrenheit for 20 to 25 minutes per pound.