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.
Plan on oven-roasting the rump roast at 325 degrees Fahrenheit for about 28 to 33 minutes per pound for medium-rare meat, though the exact cooking time will vary depending on the roast's shape and size. Begin checking the meat after 45 minutes and continue checking it every 15 minutes after that.ump roast can be cooked in the oven or in a slow cooker. If you choose the oven method, you'll need to use a large covered pot such as a Dutch oven that can easily contain the meat or a roasting pan that can be covered with aluminum foil.