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Feeding a few mice:

I would recommend Supreme Science Selective mouse food
Ingredients: Wholemeal wheat flour, soybean meal, barley, hazelnuts, oats, dried apples, soya oil, dicalciumphosphate, limestone flour, salt.
Nutriton: Protein 14.0%, Crude fibre 4.0%, Fat content 4.0%, Inorganic matter 5.0%, Calcium 0.6%, Phosphous 0.4%.
At this time Supreme only produce this food in 350g bags, which is no good to people with full studs of mice, but I thought I'd mention it because it really is excellent food for those who have a few mice, where big bags of food would go to waste. The ingredients and nutritional content are the best I've seen in commercial mouse food.

Feeding a large stud of mice:

All information is gathered from my own experience keeping mice. It is much cheaper to make up your own mix of food from large bags of feed, than buying enough of a commerical mix.

Commercial rat and mouse mixes will contain a protein level of 10 to 15%, which is perfectly fine for pets, but a mouse stud contains mice that need a lot more protein for breeding, nursing, growing, and keeping condition on the show bench. You want to be feeding 15% protein at the minimum but preferably it should make up 18 to 20% of the nutritional intake.

You can use a multitude of feeds as your base. The base of the diet would need to consist of at least 70% grains (such as oats, barley, wheat, etc) or herbivore feed (such as rabbit or goat food). You can mix these to make the base; for example 40% rabbit feed, 20% oats and 10% barley, which adds a lot of variety for the mice to pick through. There is information on each of these options further down the page.

The remaining 30% can be made of bird seeds, dog kibble, cat kibble; basically any suitable dry food that is higher in protein than the grains. The ratio of grains to protein foods can be varied to suit your mice. If your mice are looking greasy and itchy change the mix so it contains more grain. If you mice are lacking condition and their coats are looking drab, up the protein.

Making Your Own Mix from Straights

If you have a lot of mice, you'll find it cheaper to mix your own food than buy rat or mouse food. Large bags of straights (pure grain) for horses can be bought cheaply and easily at under 10 per 20kg bag, and you should mix these grains with bird seeds and/or dog food to complete the nutritional spectrum.

Grains you can use in a mouse food mix include oats, barley, rye, wheat, maize, buckwheat and spelt. Some people add dried pasta and cereal to their mixes, but I personally wouldn't add processed food intended for humans to an animals' diet. If you do, make sure the foods you use are as low as possible in salt and sugar.

Examples of mixes made from straights:
1) 40% rolled oats, 30% flaked barley, and 30% parakeet mix.
2) 40% mixed poultry corn (wheat, barley and maize), 30% flaked barley or oats, and 30% wild bird seed.
3) 40% rolled oats, 30% mixed flakes (peas, maize and barley), 30% small dog kibble

Flaked Barley | Rolled Oats

Parakeet Mix | Mixed Grain

Mixing a Diet from Other Complete Livestock Foods

There are many other animals who share similar nutritional needs to mice, and their feeds contain many similar ingredients to rat/mouse food. These include pigeons, pigs, horses, hens, rabbits and goats. Big bags of food can be bought fairly cheaply and are easily modified into a good mouse diet.

Pigeon Feeds:

Ingredients: extra wheat 19%, extra barley 35%, dari 15%, milocorn 6%, rice 5%, paddy rice 8.5%, safflower 5%, peeled oats 4%, buckwheat 1%, linseed 1.5%

Ingredients: Barley, Wheat, Red Dari, White Dari, Linseed, Buckwheat, Safflower, Groats

Chicken Feeds:

Typical Analysis: Crude protein 16.0%, Crude oils & fats 3.5%, Crude fibre 4.0%, Crude ash 12.5%, Calcium 3.75%, Phosporus 0.7%, Sodium 0.15%, Lysine: 0.71%, Methionine: 0.36%.
Ingredients: Wheat, Extracted Sunflower, Limestone Flour, Wheatfeed, Dehulled Soya Bean Meal, Distiller's Wheat Grains, Vegetable Oil, Vitamin/Trace Mineral Premix, Dicalcium Phosphate, Salt, L-Lysine, Sodium Bicarbonate, Pumpkin,Squash, Broccoli, Spinach, Tomato.

Goat Feeds:

Typical Analysis: Protein 14%, Oil 3,25%, Fibre 7.5%, Ash 7.5%
Ingredients: Bruised Oats, Micronised Barley, Hipro Soya, Micronised Maize, Wheatfeed, Micronised Peas, Linseed Lozenges, Locust Beans, Grassmeal, Soya Hulls, Beet Pulp, Oatfeed, Limestone, Dicalcium Phosphate, Vitamins and Minerals, Salt, Soya Oil, Sel-Plex, Molasses

Ingredients: 40-25% flaked barley, 25-10% grass nuts, wheat feed, flaked maize, sunflower ext, 10-0% molasses, flaked peas, rice bran, calcium carbonate, ammonium chloride, salt, hipro soya, oatfeed, vitamin/minerals, premix, dicalcium phosohate.

Pig Foods:

Nutrient Analysis: Protein 16.0%, Oil 3.0%, Fibre 4.0%, Ash 5.6%.
Ingredients: Wheat, Wheatfeed, Distiller's Wheat Grains, Dehulled Soya Bean Meal, Extracted Sunflower, Limestone Flour, Vitamin/Trace Mineral Premix, Vegetable Oil, Salt.

Nutrient Analysis: Protein 18.0%, Oil 3.0%, Fibre 3.5%, Ash 5.0%.
Ingredients: Wheat, Wheatfeed, Dehulled Soya Bean Meal, Oatfeed, Barley, Distiller's Wheat Grains, Limestone Flour, Vegetable Oil, Vitamin/Trace Mineral Premix, Salt.

Rabbit Feeds:

Nutritional Analysis: Protein 12.5%, Oil 2.5%, Ash 4.3%, Fibre 6.6%, Vitamins A, D3, E and Copper
Ingredients: Flaked peas, grass pellets, whole oats, flaked maize, extruded biscuits, extruded locust beans, flaked wheat, whole wheat, herbs.

Nutritional Analysis: Protein 13.5%, Oil 3.0%, Ash 4.0%, Fibre 7.0%, Vitamin A, D3, E and Copper
Ingredients: Flaked peas, oats, extruded biscuits, grass pellets, flaked maize, flaked wheat, whole wheat, carrot flakes, banana flakes, minerals and vitamins. Sprayed with an apple/peach flavour.

Typical Analysis: Moisture 11%, Protein 13.5%, Oils and Fats 4%, Fibre 10%, Ash 4.5%
Ingredients: Wheat, Toasted Pea Flakes, Oats, Wheatfeed, Toasted Maize Flakes, Oatfeed, Grass, Sunflower Extract, Whole Maize, Apple (min. 4% in extruded nugget), Vegetable Oil, Lucerne, Vitamins and Minerals, Syrup, Carob Meal, Linseed. with Anitoxidant: EC Additive.

Horse Feeds:

Nutritional Analysis: Protein 13%, Oil 8.5%, Ash 6.0%, Fibre 87.0%, Calcium 1%
Ingredients: Bruised Oats, Micronised Wheat, Molasses, Micronised Maize,Soya Bean Meal, Micronised Soya,Extracted Sunflower Meal, Micronised Peas, Soya Oil, Dicalcium Phosphate, Dicalium Sulphate, Distillers' Grains, Linseed, Vitamins and Minerals, Calcium Carbonate,Soya Hulls, Whey, Grass Meal, Calcined Magnesite, Sodium Chloride, Digest Plus prebiotic (ScFOS), Yea-Sacc1026.

Typical Analysis: Protein 8.5%, Oil 2.4%, Fibre 20%, Ash 9%
Ingredients: Wheatfeed, Chopped Cereal Straw, Oatfeed, Wheat, Cane Mollasses, Limestone, Full Fat Linseed, Salt, Minerals

Analysis: Protein 12.5 Oil 2.9 Fibre 4.3 Ash 2.0
Ingredients: 50% Barley, 25% Peas, 25% Maize

Feed Suitable for Adding to Any of the Above:
Any of the above feeds should make up 70 to 80% of the overall diet. The remaining 20 to 30% should consist of seeds and/or meat based proteins. Seeds which can be added to anything listed above include (but are not limited to) sunflower, linseed, white millet, red dari, peanuts, pumpkin and black rape seeds. These can be changed for variety without upsetting the bulk of the diet. You can buy a variety of these seeds premixed in the form of parakeet mix, parrot mix and wild bird seed. Other feeds which can be added in addition to or instead of seeds include dry dog food and dry cat food. These don't have to be high quality. The expensive dog and cat feeds contain meat as their main ingredient whereas cheap ones have a lot more grain in them - which is not so good for cats and dogs, but better for mice.

Dog Feeds:
There are a few dog feeds which are suitable for feeding as a complete mouse diet. Bear in mind that the cheaper the dog food the more grain it contains; so what would be a very cheap, poor diet for dogs makes an excellent mouse diet for breeding and growing mice. The two examples I've given below (Vitalin Original and Chudley's Original) contain 18% protein and the major ingredients are grains, which makes these suitable to feed on their own (for active breeding mice or growing weaners) or in a 50/50 mix with grains:

Analysis: Protein 18%, Oil 3.2%, Ash 6.8%, Fibre 2.8%, Moisture 12%
Ingredients: Cooked Wheat, Cooked Sweetcorn, Meat & Marrowbone, Soya, Cooked Barley, Vitamins & Minerals.

Analysis: Protein % 18.5, Oil % 8.5, Fibre % 3.0, Ash % 5.5
Ingredients: Wheat, chicken meat meal, maize, glucose syrup, chicken fat, wheat feed, peas, unmolassed beet pulp, chicken liver meal, dicalcium phosphate, soya oil, salmon oil, de-hulled soya bean, prairie meal, salt, yeast, potassium chloride, carrots, blackcurrant extract, charcoal, fructose oligosaccharides, with EC permitted antioxidants; mixed tocopherols, vitamin C and rosemary extract. With EC permitted colours, sunset yellow and ponceau 4R red.

Rolled oats, flaked barley, parakeet mix

Rolled oats, flaked barley, layers pellets

Mixed poultry grain (wheat, barley, maize), pigeon feed

Vitalin original, parrot mix

Mixed poultry grain (wheat, barley, maize), Vitalin original