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An attempt was made to predict the length of dry hides on the basis of body mass at the age of 12, 16 and 20 weeks, the body mass during the Autumn assessment /licence/, after slaughter, and the mass and length of humid hides of 74 males and 56 females of polar foxes. The authors indicated the influence of the litter, the origin and sex on the shaping of all examined characteristics of the animals and the influence of the time of birth on the body mass of 12 weeks old males and females and the mass of humid hides of females. Of the greatest cognitive value were equations assessing the length of dry hides made on the basis of measurements of body mass and the mass and length of humid hides. Although these equations were very exact they were of little practical value since they could not be used in the assessment of live animals. The exactness of equations assessing the length of dry hides only on the basis of measurements of body mass did not exceed of 74% accuracy of equations considering the body mass and the mass and length of humid hides. Such equations may be useful in practice because the standard error in assessing these equations does not exceed 3.0-3.2% of the length of dry hides. Measuring the body mass of 20 week-old males and measurements of the body mass of females during the Autumn licence made on the basis of live characteristics have been of the greatest significance in assessing the length of hides.
Litters born at approximate times, of a similar average mass of kits, was - after weaning and of a differentiated quantity /seven classes of litter numbers/ - allotted to four equally numbered groups /52 kits from seven whole litters/ with an equal number of males /23 animals/ and females /29/ in each group. The authors employed various methods in separating six-week old kits from their mothers. The method of weaning, the number of litters, the sex of kits and the separating term influenced the body weight on the 30th day after weaning at the age of 16 weeks and the size and body mass during the licence of polar foxes. Foxes disengaged during weaning and deprived of any contact with their mothers were most susceptible to stresses, while this effect was the least in kits left - after being separated from their mothers - in the cage of dam and maintaining during one month a complete visual auditory and olfactory contact with their mothers kept in an adjoining cage.
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The average relationship between bulls qualified to reproduction (selected) and cows in insemination region is the basic task of the system. The chief point of applied method is to evaluate numbers of daughters, granddaughters and great granddaughters of assumed bull, which live in consecutive years. These numbers (precisely fraction) are astimated on the ground of such characteristics of population as distributions of age at first calving and calving period, and survival rate to consecutive ages. After multiplication those fractions by number of semen portions of particular bulls used earlier in the region, one estimate real numbers of female descendants in actual year. These descendant numbers in conection with relationship coefficients between the bull qualified to reproduction (proband) and all bulls used earlier in the region give basis to evaluation of the average relatioship between the proband and all cows „living" in the region.
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