Guinea Pigs

Guinea Pigs are herbivorous rodents that have a well-developed caecum (hind gut) for fermentation of plant material. They require a high fibre diet consisting mostly of grass and hay. Unlike other small mammals, guinea pigs have a have a special dietary requirement for Vitamin C (Ascorbic Acid) which they obtain from fresh plant material and leafy green vegetables.

Young guinea pigs are born well-developed (precocial), fully furred, eyes open and mobile soon after birth. They have a high requirement for protein in early life to sustain their rapid growth rate, and this is provided by the mother's milk for upto 3 weeks of age.

Our products include Guinea Pig Milk Replacer, hand-rearing accessories as well as healthy supplements and treats for adult guinea pigs.

  • Guinea Pig Milk Replacer

    Wombaroo Guinea Pig Milk Replacer is a nutritionally balanced milk substitute for guinea pigs. Use for orphaned pups, large litters or when mother’s milk is limited.

    Key Features

    • Specifically formulated to match the composition of guinea pig milk.
    • High in Protein Content - to sustain the rapid growth of pups.
    • Contains stabilised Vitamin C - an essential nutrient for guinea pigs.

    Download Data Sheet


    Whey proteins, caseins, whole milk solids, vegetable oils, omega-3 (including ALA, EPA & DHA) and omega-6 fatty acids (including Arachidonic Acid), vitamins A, B1,B2,B6, B12,C,D3,E,K, nicotinamide, pantothenic acid, biotin, folic acid, choline, inositol, calcium, phosphorus, potassium, sodium, magnesium, zinc, iron, manganese, copper, iodine, selenium.


     Solids when reconstituted           190g/Litre        
     Protein (%db)        42%           
     Fat (%db)     24%          
     Carbohydrate (%db)  16%        
     Fibre (max)  0%         
     Vitamin C (min)  500mg/Litre          
     Metabolisable Energy (ME)  3800kJ/Litre          

    Pack Size

     190g (makes 1 litre).

    Success in hand-rearing young guinea pigs (pups) greatly improves if they receive colostrum at birth. Pups that don’t get colostrum from the mother can be fed Impact Colostrum Supplement. Commence feeding Wombaroo Guinea Pig Milk Replacer after the initial feeds of colostrum.

    Making up Milk

    To make 35mL of milk: Mix 1 level scoop of powder (6.5g) with 30mL of warm water.

    To make 1 litre of milk: Mix 190g of powder with 870mL of warm water. 

    Add half the water to the powder first and mix to a paste. Then add the remaining water and mix thoroughly. Pre-boil the water to ensure it is sterilised. If the water is too hot it can cause the milk to curdle. If it is too cold then it will be difficult to disperse the powder. Wombaroo contains elevated protein levels, so the milk needs to be well mixed to prevent it from separating out. An electric whisk can be used for mixing larger quantities. Milk can be stored in the fridge for a day or can be frozen for up to 2 weeks. It is useful to make-up larger quantities and store it frozen in small portions (eg ice cube trays), so that the required daily feed volumes can be easily thawed out. Once thawed out, discard any unused milk, and wash feeding utensils thoroughly.


    Warm milk to about 35°C. Feed from a syringe or bottle with teat, a Wombaroo P Teat is recommended. Feed every 2-3 hours for the first 5 days, reducing this to every 4 hours thereafter. Once significant solid food is being consumed the quantity and frequency of milk feeds can be reduced accordingly. Pups will need to be stimulated to defecate and urinate in the first week of life. As pups are well-developed and mobile, they may be encouraged to lap soon after birth. To avoid dehydration during periods of hot weather supply plenty of fresh water. Consult your veterinarian or breeder for particular advice about caring for young guinea pigs.


    Different breeds of guinea pigs have different growth rates. Carers should contact their veterinarian or breeder for information about the growth rate of their particular breed. Weigh pups regularly to verify weight gains and determine the volume of milk to feed. Overfeeding milk can cause diarrhoea so feed the suggested volumes in our tables.


    Pups may begin to show interest in solid foods around 2-3 days of age. Ideally pups should have access to caecotrophs (caecal pellets) from a healthy adult animal to help establish the correct gut flora. Initially establish young guinea pigs on hay, green leafy vegetables and some pellets. Once they start to eat solid food continue to increase solids and reduce milk intake until they are fully weaned at around 14-21 days. Avoid any foods containing high levels of starch or sugars (eg root vegetables, grains or fruit) until fully weaned. Because of their ability to eat solid foods from an early age, many carers will tend to wean guinea pigs early (around 5-7 days). However this practice restricts protein intake at the peak growth stage, and may lead to developmental problems and even stunting of growth. We recommend to maintain pups on some milk for as long as possible (up to 21 days) as is the case with mother-reared pups.

    Feeding Guide

    20 9 70 22 120 33
    30 12 80 24 130 35
    40 14 90 27 140 37
    50 17 100 29 150 39
    60 20 110 31 160 41

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