While a wild rat doesnt lend to breed at home, his domesticated consanquinity is as pet badly priceless. Lot of people discourage already with the name – „Rat“ and they dont awake thereat to a laboratory rat is cleanly as well as a hamster or a guinea-pig and in addition the rats are very intelligent. The invincible hindrance breed a laboratory rat at home, for some people, can be white colouring and pink tail. But They are bred in various coloured mutations today. The best known is probably hooded rat with blak coloured head and deep belt on the back. Harlequins are also very attractive, who are sporadically speckled and they range in different colours. Aguti best admonish about wild predecessor, they are fuscous coloured. Beside that there range rats in black colour, cream-coloured, cinnamonic-coloured, red-brown, silvery, chocolate brown oloured and in many others tints.There exist also the forms with a fuzzy hair, remindful so-called Angora-hamsters, but also mutations quite without hair.
The Relatively strong acetamid stench is one and only rats negative feature, by which mostly males feature. We can in some ways precede that snetch by antiseptic. The plastic boxes, size 55x32x18 cm (VELAZ T4 type), are the best for rats breeding, or resembling, covered overhead by the cover cover from the perforated metal plate, with leaks for a feeder and a feeding pump. We can breed rats also well in bonded boxes with size 50x30x30 cm equipped covers. We use sawdust or shavings as bedding, which have the absorbing properities. The placing boxes is also very important. The rat is rather a lucifugous animal, that is why their breedings should preferably be in a dusk. The tempetature should not be too vary, optimal is between 21-25 °C, only hairless mutations require the temperature about 28 °C. The polygamous breeding is used most frequently, when we give a male to 2-6 females and we separate gravid females to smallish separate boxes several days before births. We can use also the couple- or group-breeding, when we give larger number of females to some males, this method is approached the social structure of rats family in their free life, but on the part of breeder it is the least productive, because all subjets seldom come in reproduction and also the wastes of the youngs are ussually higher. The females rut come on every 5 days and makes itself felt, among others, raised rats unrest. Their gravidity last 21-23 days, sometimes even 34 days (at larger number of embryos). The young weigh 4,5-6 grams at birth. Their number is mostly 5-10, but also 23. It is recommend to keep only 7 young at a female, with the view of their right progress. The young open their eyes between the 12th and the 15th day, they could put aside mother after 4 weeks. They are sex-advanced in 2 months, but we insert them to our breeding untill as late as 3 or 4 months, when they are also physical-advanced. It is ussually succeed to shelter 7-10 litters from a female, The males subside be bearing between the 1st and the 2nd year. They last out 2-4 year,  the record age was 7 years. Man can breed either complete granulated mixture for rats (DOS, ST-1, LD), or mixture varied corn, fruits, vegetables, root-crops and hard-tack. We tack to plant food tails of flesh lean or boiled meat, some cheese, a little curd, tails of eggs or yeast.The rats have water requirement relatively high, therefore they should have water available in automatic pump-feeder all the time.