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A cat can be fed a maintenance or adult diet once it is 10 months to one year of age. An adult cat with normal activity requires only a maintenance diet- enough to maintain a good body condition. A healthy cats body condition is one in which the animal is well proportioned with an observable waist behind the ribcage, and ribs which are not clearly visible but that can be felt with a slight fat covering over them.
Cats require a higher level of dietary protein in their food-about twice as much as dogs- and at least one-third of their diet should consist of animal protein. They require the addition of taurine to their diet. A good diet is rich in fat, which the cat's digestive system is equipped to cope with easily. Commercially prepared cat foods are available from shops as dry food, moist (canned) food and semi- moist food. Dry food is easier to serve and won't spoil if left out for the day. It's also considerably cheaper. Also these foods exercise the cat's teeth and gums. Be sure to choose age specific food for your growing or adult cat. You could feed your kitten commercially prepared food with small amounts of other fresh foods like cooked meat, fish and eggs, cheese, liver (raw or cooked) in small amounts etc. Adequate supply of clean water at all times is essential for your cats survival. A typical cat requires about 150-200ml of water a day. Moist or canned foods usually contain about 60- 85% water, so cats on a canned food diet require less water but those on a dry food diet will require to drink more.
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You have to make a decision whether you are going to confine your kitten indoors or allow him outside at about eight to nine months of age. It depends upon the type and temperament, some long haired breeds like Persians may be suited well for indoor living while other more active and independent breeds may become frustrated by indoor confinement. But kittens or older cats allowed outside should always come indoors to sleep, eat etc. In the initial stages, one can entice them indoors with food such as fish until it is established that home is where the food is.