The results of studying the implemented reproduction of local migratory flows of the Taimyr wild reindeer population in the middle reaches of the Pyasina River, at the border of the western and central parts of the Taimyr Peninsula (71°30′–71°43′ N), Siberia, in the postnatal period in 2007, are presented. Comparison of reproduction in two different migratory flows has shown a lower fecundity in the Puropyasina branch of the reindeer population, with 47 calves per 100 adult females recorded. These rates were 64 calves per 100 adult females in the second, Tareya–Pyasina local branch. In both migratory flows studied (n = 546) with various levels of barrenness, animals of all reproductive ages, ranging from two to 16 years, were involved in breeding in different age groups. However, the maximum contribution to reproduction belongs to seven-year-old females, the most numerous and fecund generation in both flows. [ABSTRACT FROM AUTHOR]