Abstract
The sex ratio of Siberian crane chicks (Grus leucogeranus Pallas) from the captive population ofthe Oka Crane Breeding Center was analyzed with the use of molecular sex marker EE0.6 in 2009-2014. We determined the sex of 84 birds bred from 12 dams by means of artificial insemination and natural breeding. The total primary sex ratio was 40:44, and the secondary sex ratio was 36:39 with a minor predominance of females. The mortality rate of embryos was the same for both sexes. The primary and secondary sex ratio among the first eggs in clutches showed the same trends as those observed in general analysis. The relatedness of parents by microsatellite DNA has no effect on offspring sex in both natural breeding and artificial insemination.
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