Growth of newborn marmots [Croissance des marmottes nouveaux-nés].

Résumé

In 2001-2002 regularity of a linear growth of marmots from day of their birth to 18-month’s age have been studied. Researches have established length of a body of newborns marmot babies (9-10 cm) and their average alive mass (2930 g). Intensity of growth at the first month of marmot life is high. The alive mass increases more than in 10 times to 30 days and amounts on the average 383.6 g in females and 432.0 g in males. The body length increases to this age in 2.5 times. At females it averages 22.9 cm, at males 24.7 cm. From 1.5 month’s age (after wean) measurements of the basic parts of a body of young marmots were made. For 100 days (from 45 to 145 days age) the length of a body of females has increased by 61.3 %. The length of a head young (males and females) has increased in 1.5 times. The length of a hand to an elbow joint has increased from 9 to 13 cm at females and from 8.2 to 13.5 cm at males. The breast volume behind scapulas at females has increased by 86 %, at males by 93 %. The greatest intensive growth is noted at young marmots in alive mass. For 100 days the alive mass of females has increased in 5.2 times, of males, in 5.8 times. To 145-day age, females had 4580 g and males 4642 g. According studying of regularity of young marmots growth from birthday to the first hibernation (150 days) the augmentation of alive mass for this period in 150 times and of body lengths in 5 times are established. More intensive growth of young marmots has been registered in the first 45 days. The sex dimorphism in the body size was not found at the first year of their life.