In the past, Chinchillas were kept in pairs. The group breeding is currently based on the rearing of polygamy which is much more efficient. 4-6 females are dedicates to one male. Poligamous breeding has its advantage, because one male fertilizes a few females, in the intervening period, more offsprings are expected to come to the world, moreover, it is easier to reach the colour you want. This method is more efficient, because it requires less males, cages and the lower feed costs. The chinchilla females are sexually mature at the age of 7 months. In order to pair them, the chinchilla can be not younger than 7-8 months. The duration of the pregnancy of chinchillas takes 111 days, it may sometimes last a few days earlier or later. It is very important that pregnant females would not be moved from their usual location while they are pregnant, even in the same room. Chinchilla females cub without any intervention or help. Cubbing usually takes place early in the morning. The end of the cubbing can be recognized by seeing if the female has eaten the placenta. Normally there cannot be any milk absence, if it happens, it means that the nutrition is poor. During the day when the cub should start, bathing in the sand is not allowed because of the possible risk of uterine and vaginal inflammation. Chinchilla chicks are born hairy and they can see. Already during the first minutes they can run and search for mum’s nipple to start eating. When the female has 3 offsprings or more, they should be feeded additionally. After 8 weeks, the chicks are separated from the mother and placed in individual cages. If you have 2 or more chicks to grow in a cage it is advisable to keep exceeding up to 4 months after the date it is necessary to distinguish between them and move into separate cages. During this period, you can already decide which of the chinchillas will be left for breeding, and which for their fur.