The guinea pig (Cavia porcellus), also called the “cavy”, is a species of rodent belonging to the family Caviidae and the genus Cavia. Despite their common name, these animals are not in the pig family, nor are they from Guinea. They originated in the Andes, and earlier studies based on biochemistry and hybridization suggested they are domesticated descendants of a closely related species of cavy such as Cavia aperea, C. fulgida, or C. tschudii and, therefore, do not exist naturally in the wild. Guinea Pigs Average Weight [2] 900 grams = 1.98 lbs. Male: 900-1000 grams about 2 lbs. The most important nutrient for any animal is water. Fresh water should be offered at all times, and guinea pigs can drink from a water bottle. This type of watering system is ideal for keeping the enclosure dry. Water bottles should be emptied and refilled with fresh water every day. Bottle brushes should be used to prevent build up of debris inside the water bottle. The basic diet of a guinea pig should be timothy hay.
Grass is the guinea pig’s natural diet.
Having small amounts available all the time is important, since guinea pigs are “grazers”. Eating and digesting hay helps maintain intestinal and dental health. Alfalfa hay should not be fed due to the higher levels of calcium, which can cause urinary tract problems. But alfalfa can and should be fed to baby (growing) and pregnant nursing pigs because the extra calcium and protein aids in proper development. Commercially available pellets formulated specifically for guinea pigs can be fed in small amounts. Food bowls should be cleaned daily. Guinea pigs cannot synthesize their own vitamin C and must obtain this vital nutrient from the food they eat. Other sources of vitamin C include [2]: Iceberg “head” lettuce does not contain many nutrients and may cause diarrhea if fed too often. Guinea pigs require 10 to 30 mg/kg (mg of vitamin C per kg of guinea pig body weight) daily to prevent scurvy. While many guinea pigs receive adequate vitamin C from fresh vegetables and pellets, to ensure they get adequate vitamin C you may give a quarter of a 100 mg chewable or plain vitamin C tablet, or provide a small amount of liquid vitamin C drops to each guinea pig.
Young, ill, nursing and pregnant animals require extra vitamin C. Do not add vitamin C to the water. Water is vital to good health but because vitamin C changes the flavor, it may discourage drinking. Ascorbic acid degrades rapidly once added to water. Some guinea pigs drink a lot and some very little, so if you add it to water it is impossible to know how much vitamin C the guinea pigs are receiving. Fresh, cold water, changed daily, (usually provided in a drip bottle to prevent contamination) should always be available. Avoid water high in minerals, especially if high in calcium. Do not put vitamins or medications in the water. Plain, dye free, high quality guinea pig pellets (mixes with nuts are considered too rich), formulated with Vitamin C can be provided in a small heavy ceramic bowl to prevent tipping. Each guinea pig will eat approximately 1/8 cup of pellets a day when also fed adequate hay and fresh vegetables. Purchase pellets in small quantities and store in a dry cool dark place to preserve the potency of the Vitamin C (look for a pellet with an expiration date to check for freshness).
Look for a pellet that uses stabilized vitamin C and has a “Best If Used By” date to ensure quality. Avoid pellets that use animal byproducts and those whose primary ingredient is corn. Most guinea pig pellets are alfalfa based. Alfalfa pellets are suitable for young, growing and pregnant cavies. After a guinea pig is about a year old and fully developed, a timothy based pellet, which provides less calcium, may be a good choice . Two quality timothy based pellets are Timothy Choice pellets by KM’s Hayloft and Cavy Cuisine by the Oxbow Hay Company. Unlimited high quality, grass hay (timothy and orchard grass are popular) should always be available to each and every guinea pig, no matter what age. Eating the long hay strands keeps their digestive system moving and helps prevent their teeth from over growing. It is usually placed in a wire rack off the floor for cleanliness. Alfalfa hay can be given to young guinea pigs, pregnant, nursing or malnourished adults. But because of its high calcium content, alfalfa should be reserved as a treat for the average adult guinea pig.
Excess calcium could contribute to the formation of bladder stones in older cavies. Remember that alfalfa is NOT a replacement for grass hay, but can be used to supplement the diet of some pigs. And remember, pellets are not a substitute for hay! High quality grass hay should be available for each guinea pig at all times. Small amounts of fresh vegetables (about a cup a day) are an important additional source of vitamin C and other nutrients. Parsley, romaine lettuce (rather than iceberg, which has less nutritional value and may result in loose stools if given in excess), a small piece of carrot, tomato, green or red pepper, spinach, and cantaloupe are popular choices. And clean, pesticide-free grass, clover, dandelion greens, corn husks and silk are appropriate. Do not feed wilted or spoiled food. Vegetables must be introduced slowly, to avoid digestive upsets. Once introduced, you can supply a variety of them to guinea pigs. Make sure that pellets, grass hay and water are always available (most guinea pigs will not over eat).
Vegetables can be provided two or more times a day, removing uneaten vegetables to prevent spoiling. * NOTE: Guinea pigs eating a lot of romaine seem to excrete more powdery calcium deposits in their urine. Red and green leaf lettuce may be a better choice for your guinea pig, especially if they are prone to stones.Guinea pigs' food requirements are fairly simple, but it is easy to get them wrong and end up feeding your pets foods which don't provide them with enough essential nutrients and minerals. Worse still, by giving them the wrong diet, they may become obese or seriously ill. The following food list provides a guide to the things you should be feeding to your cavies, what you should avoid, and any special requirements you may not be aware of. A high-quality pellet or dry food forms the basis of a healthy guinea pig diet. Supplemented with plenty of fresh vegetables, hay, and water, your cavy will have all the nutrients it needs. Pellets are considered better than mixes, and are available in two types.
Alfalfa hay-based pellets are ideal for young and pregnant pigs because they contain a higher level of calcium. This can cause bladder stones in adults, so you should switch your pets to a Timoty hay pellet at around 12 months old. Although they don't look as interesting as dry food mixes, pellets provide a better nutritional balance. Image by Cat Wendt. Dry food mixes aren't as good as pellets because they allow your cavies to pick and choose what to eat, and leave the rest. This can result in a unbalanced diet. You should also avoid mixes which contain nuts and seeds, as the husks can get stuck in your pets' teeth and cut into the roof of their mouth. Most pet stores sell a variety of pellets and mixes, from suppliers such as Oxbow, Wagg, Gerty, and Burgess Excel. Avoid the cheap, loose mixes sold in buckets and buy a quality, sealed, brand-name food instead. Each of your guinea pigs will need between half and one handful of dry food per day, but adjust the amount you give yours according to what they eat.
Serve in a heavy ceramic bowl, as these are less likely to be tipped over. These are the best source of vitamin C and other nutrients, and also help to keep your animals a varied and interesting diet. Each pig should be given 3 to 5 matchbox-sized portions of fresh vegetables each day. Vegetables are a guinea pig's favourite food, and also offer the best balance of nutrients - make sure your pigs get plenty. Before serving, wash the vegetables thoroughly, remove any seeds, and cut into bite sized chunks. Many veggies come with leaves attached, which your guinea pigs will also enjoy. Favourites include bell peppers, broccoli, and Romaine (cos) lettuce. Never feed your pets potatoes, rhubarb, or iceberg lettuce as these can all be potentially toxic. Any vegetables you give your pets will rot quickly, so any leftovers should be removed from their cage after an hour or two and thrown away. Fruit is much higher in sugar than vegetables and so should not be given to your pets more than once or twice a week.
Guinea pigs will eat almost any type of fruit, so try a few to see what yours prefer. Apples seem to be particularly popular, but try to get the more 'flowery' varieties as these are less acidic than crunchier ones. Guinea pigs love fruit, but be sure to feed it in moderation. The only other type of fruit to be wary of are grapes, as it has been suggested that they might cause kidney disease, although this has yet to be proven. Again, fruit rots very quickly, so throw it away after an hour or two. This is an essential guinea pig food, and you should give your pets a constant supply of fresh, clean, dry hay at all times. It helps to regulate their digestion, and they also grind it between their teeth to keep them short (guinea pig teeth keep growing throughout their life). Your pets will also use it as a bedding material, so make sure they have lots, and refresh it regularly. Hay is essential for digestion and dental health - make sure your cavies have a plentiful supply at all times.
Image by David Locke. There are two main types of hay, Alfalfa and Timothy. Alfalfa is best for growing and pregnant guinea pigs, but its high calcium content can cause bladder stones in adults. To prevent this, once your pigs reach adulthood (at about 12 months), you should switch them on to Timothy hay. Although this is not essential, guinea pigs find it really tasty, and it also provides several important vitamins and minerals, including vitamin C. You should always use fresh grass which is free from herbicides and other chemicals. Don't use grass which has been cut by a lawnmower - tear it out of the ground instead. As with vegetables and fruit, this rots quickly, so remove it from their cage after one or two hours. Fresh grass is a great source of vitamins and minerals. During the summer months it's a great idea to put your guinea pigs outside in a run. This way they can have an endless supply of fresh grass, and get plenty of exercise at the same time. Guinea pigs cannot produce their own vitamin C, so it must be provided in their diet.
A deficiency can lead to serious diseases such as scurvy, bone deformations, and immune system problems. If you are giving your pets plenty of pellets, vegetables, and grass, then they should be getting all the vitamin C they need, but if not you can give them a supplement. A high-quality vitamin C supplement can help ensure your pets get all nutrients they need to stay healthy. Vitamin C supplements come in tablet form and as water-soluble medicines. However, vitamin C degrades quickly in water and sunlight, so always choose the chewy tablets. This also makes it easier to ensure that each pig is getting the right amount, and they love the taste as well. Water is essential to a number of important bodily processes, so make sure your cavies always have plenty of fresh, clean, cool water to drink. You should change it at least once a day, and more often in warm weather. Check the level frequently throughout the day and top it up when required. Make sure your pigs always have a plentiful supply of clean, fresh water.
Image by Roy Stead. Water bowls are prone to being tipped over, and quickly get filled with bedding, so water bottles are considered to be better. Whichever you use, be sure to clean it thoroughly several times a week (with a bottle brush if necessary), and check it periodically for leaks and to make sure the spout is working properly. Guinea pigs don't crave treats like humans do, so there's really no need to give them anything special. In fact, typical human treats such as chocolate, cakes, and biscuits are toxic to a guinea pig, and can cause serious health issues. The best treats for cavies are fresh vegetables, fruit, and fruit tree twigs. Fresh fruit and vegetables make the tastiest, healthiest treats. They are herbivores so never give them anything containing meat or dairy products - they won't be able to digest it properly. Guinea pigs can respond badly to sudden changes in their diet, so it's important to introduce new foods gradually. Begin by giving them a little bit of the new food alongside their normal diet so that they can get used to it.
Over time, gradually increase the amount of the new food and decrease the amount of the old. They can be slow to try new things, but persevere and eventually one of them will have a nibble on the new food. Once one does, the others tend to follow. With a bit of luck they will like this new taste, but if they don't then don't worry, as there are plenty of other things for them to try. Guinea pigs are a lot like humans in that their tastes vary greatly, so what one won't eat, another might love. Keep a mental note of how much food and water your pets are consuming. Gradual variations are natural - for example they will naturally eat more as they get older, and will drink more during the summer months. However, sudden changes can be an early sign of illness. You should also keep track of your pigs' weight. Using kitchen scales, weigh each of your pigs weekly and write it down in a notepad. If you notice any sudden changes or long-term trends, this may be a sign of an underlying problem, so take your pet to the vet, and be sure to take your weight diary as this will provide the vet with essential background information.