Genetic demographic characteristics of the rural population of Tuva Republic: Reproductive parameters and the structure of Crow's indices

The age limits of the female reproductive function, vital statistics, and C row's indices were estimated in populations of three districts of the Tuva Republic that were remote from one another. These were the Kyzyl (the Shina an population), Todzhinskii, and Bai-Taiginskii raions. The monoethnic Shin aan population was characterized by the longest reproductive period (15.88 years) but the lowest average number of pregnancies throughout the reproduc tive period (5.77); childbirth was an outcome of 86.72% of pregnancies. In the Bai-Taiginskii population, which was also monoethnic but lived in an in dustrial area of Tuva, these parameters were 12.99 years, 7.06 pregnancies, and 81.97%, respectively. The Todzhinskii population, which was ethnically mixed, exhibited the shortest actual reproductive period (10.72 years) and the greatest average number of pregnancies throughout the reproductive per iod (7.29), with the proportion of pregnancies ending in childbirth as low as 48.30%. The indices of potential selection and their components related to differential mortality and differential fertility were the following: in the Shinaan population, I-tot = 0.59, I-m = 0.19, and I-f = 0.34; in the B ai-Taiginskii population, I-tot = 0.48; I-m = 0.1.8, and I-f = 0.26; and in the Todzhinskii population, I-tot = 0.90, I-m = 0.23, and I-f = 0.55. Thus , reproductive parameters in the studied populations of the Tuva Republic w ere largely determined by the ethnic composition of the population and soci al factors.