GERTY GUINEA PIG TASTY MIX - (850g to 12.5kg) - Friends Farm Animal Fruit Food Tiny Friends Farm - Gerty Guinea Pig Tasty Mix 850g, 2.5kg, 5kg or 12.5kg Gerty Guinea Pig complete muesli. A nutritionally complete food suitable for guinea pigs of all ages – delicious ingredients such as maize, oats, wheat, beans and lucerne make this a balanced diet for guinea pigs that encourages natural foraging behaviour.