Feeding Directions: A typical adult guinea pig requires approximately 40-50 g (1 .5 oz) per day of Supreme Science Selective Guinea Pig. Selective a be fed to appetite however weight and wellbeing should be monitored regularly.If you are feeding Selective to your guinea pigs for the first time, make sure you change from one food to another, gradually over 10-14 days. At first, you should mix a small amount of Selective with your guinea pig's current food, slowly decreasing the old diet, whilst gradually increasing the quantity of Selective. A sudden change in diet can cause digestive upsets - even when you are changing to a better quality diet - so take care!If your guinea pigs are used to a sugary diet, you may find it takes them a while to change, but persevere as it will help to benefit your pets' health in the long term.Fresh hay and water should always be available.