Life expectancy of a rat makes from 1, 5 up to 3 years. Younger rats adapt better and get used to the owner, that they are more trustful. The young growth peacefully unites in the general pack, and adult animals organize skirmishes which can end with death of weaker individual. It is not recommended to take rats up to 6 — 8 weeks. Young rats especially need contact with mother to get experience and skills of safety.
Instruction
1. The easiest way to define age rats consists in its weighing. The dependence of weight of rats on their age differs at males and females. The male in 2 months has weight below an average from 120 g to 150 g, average weight from 160 g to 220 g, high weight from 230 g to 260 g. The male in 3 months has weight below an average from 210 g to 240 g, average weight from 250 g to 310 g, high weight from 320 g to 360 g. The male in 4 months has weight below an average from 310 g to 330 g, average weight from 340 g to 410 g, high weight from 420 g to 450 g. The male in the 5th has month weight below an average from 410 g to 440 g, average weight from 500 g to 530 g, high weight from 230 g to 260 g.
2. The female in 2 months has weight below an average from 120 g to 150 g, average weight from 160 g to 210 g, high weight from 220 g to 250 g. The female in 3 months has weight below an average from 170 g to 200 g, average weight from 210 g to 250 g, high weight from 260 g to 290 g. The female in 4 months has weight below an average from 210 g to 240 g, average weight from 250 g to 270 g, high weight from 280 g to 310 g. The female in 5 months has weight below an average from 250 g to 280 g, average weight from 290 g to 310 g, high weight from 320 g to 350 g.
3. The scheme is rather approximate therefore before the conclusion learn what build there were rat parents and also conditions of keeping and feedings of an animal. Skilled owners of rats on visual inspection determine the approximate age of animals. At young rats wool has to shine, densely adjoin to a body, the fat layer is evenly distributed on all case. The old animal possesses more rare and dim wool, a thin fat layer on a back, the backbone even in the conditions of good feeding, the skin on a tail which coarsened and rough acts.
4. If a rat at advanced age, then at her, as a rule, have problems with teeth, cutters grow too strongly. Old men rats are ill weakness of extremities, at them physical activity is reduced, they look for heat. In cutters of a rat there are no roots therefore they constantly grow. The front surface of cutters is covered with strong enamel, and behind a covering is not present, cutters are erased quicker there, sharpening of teeth gets a chisel form.