Milk for Mammals

Milk is the sole source of nutrition for young mammals up until weaning. The composition of milk is very different for each species, depending on the different physiological requirements of the growing young. Click on the links below for our range of species-specific milk replacers, each based on the composition of the natural mother's milk.

  • Flying Fox Milk Replacer

    Wombaroo Flying Fox Milk Replacer is a nutritionally balanced milk substitute for orphaned flying fox (fruit bat) pups.

    Key Features

    • Specifically formulated to match the composition of flying fox milk 
    • High protein to energy ratio for lean muscle growth.
    • Calcium for bones.
    • Stabilised Vitamin C, for proper growth of skin & joints.


    Whole milk solids, whey protein, casein, glucose, vegetable oils, omega-3 & 6 fatty acids (including DHA, EPA & Arachidonic Acid), taurine, stabilised Vitamin C, vitamins A, B1, B2, B3, B5, B6, B9, B12, D3, E, K, biotin, choline, inositol, calcium, phosphorus, potassium, sodium, magnesium, zinc, iron, manganese, copper, iodine, selenium.


    Powder Milk when reconstituted
     Protein 27% 38g/Litre
     Fat 15% 24g/Litre
     Carbohydrate 45% 64g/Litre
     Ash 6.0% 8.7g/Litre
     Calcium 1.4% 2.0g/Litre
     Metabolisable Energy (ME) 18 MJ/kg 2600 kJ/Litre

    Pack Size

    140g, 1kg, 5kg & 10kg.

    Flying fox pups are born nearly fully-furred and with eyes open. Keep pups in a clean, draught-free environment at about 30°C. Success in hand-rearing greatly improves if pups receive colostrum at birth. Pups that don’t get colostrum from the mother can be fed Impact Colostrum Supplement. Commence feeding Wombaroo Flying Fox Milk Replacer after the initial feeds of colostrum.

    Making up Milk

    To make 100mL of milk: Mix 14g of powder (2 scoops) with 90ml of warm water.

    To make 1 litre of milk: Mix 140g of powder with 900ml of warm water.

    Add about half of 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 that 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. Milk can be stored in the fridge for a day or can be frozen for up to two weeks. It is useful to make up milk in 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 either a bottle and teat or a 10mL syringe with teat pulled over the end. A Wombaroo F Teat is recommended, as this replicates the natural shape of a flying fox nipple. Feed 6 times per day for the first week, 5 times per day for week 2, reducing this to 4 times per day by week 3. Stimulate pups to defecate and urinate after each feed. To avoid dehydration during periods of hot weather provide drinks of pre-boiled water between feeds. Always offer drinking water once pups become mobile. Consult your veterinarian or specialist wildlife carer for particular advice about caring for flying fox pups.


    Different species of flying fox have different growth rates. Contact your veterinarian or experienced wildlife carer for information about the growth rate of the particular species in care. It is important to 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.


    When pups are about 6-7 weeks old introduce pureed or steamed apple between milk feeds. By 8-10 weeks they should be eating diced fruit (non-fibrous fruits such as apple or pear) coated with Wombaroo High Protein Supplement. Offer as much native fruit and blossom as possible to adjust the young to a wild-type diet. Once they start to eat sufficient solid food continue to increase the solids and reduce the milk in their diet until they are fully weaned by 12 weeks.

    Feeding Guide

    30 14 60 23 100 33 160 46
    35 16 65 24 110 35 180 50
    40 17 70 26 120 38 200 54
    45 19 75 27 130 40 220 58
    50 20 80 28 140 42 240 62
    55 22  90 31 150 44 260 65

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