Age of sexual maturity and ex interrelation in marmot population in cage breeding [Âge de la maturité sexuelle et relations sexuelles dans une population de marmottes en captivité].

Résumé

On a base of registration since 1995 to 2007, an analysis of age of the first reproduction and also duration of seasonal activity of females and males separately has been carried out. It has been established, that age of first reproduction is 2 years. In this period 9 (10.1 %) from 89 females had young. 41 (46.1 %) of 3 years old females had young. This number decreases after 5 years age. Marmot female reproduce from 2 till 8 years old. The age of the first breeding of males is 2 years. From 76 males, 10 (13.2 %) took part in reproduction. The highest number is noted at the age of 4 years – 19 (25.0 %). The activity age lasts till 9 years old. The number of breeding males 6 years older considerably decreases (2.6 against 15.8 %. Simultaneously an sex interrelation in marmot population of cage breeding was studied. 759 young have been gotten for all period: females – 394 (51.9 %), males (48.1 %). This data shows that sex interrelation is 1:1 in marmots during domestication.