Population genetic structure of Lori-Bakhtiari sheep in Iran by pedigree analysis

This study aimed to describe the population genetic structure and evaluate the state of conservation of the genetic variability of Lori-Bakhtiari sheep in Iran. In this study pedigree information of 10644 lambs born in the stud flock of Lori-Bakhtiari sheep collected during 1989 to 2016 were used, which enabled the calculation of the mean and variance of the family size in sire and dam, and pedigree analysis including pedigree completeness (PC), genetic conservation index (GCI), effective population size (Ne), effective number of founders (fe), effective number of ancestors (fa), generation interval (L), individual inbreeding coefficient (F) and average relatedness coefficient (AR), using the ENDOG software. The results showed that the average number of progeny per ram and ewe lifetime were 26.44 (range = 15-152, SD = 22.02) and 3.6 (range = 1 to 15, SD = 2.13), respectively. The mean and variance of family size in sires were different over the years. The pedigree completeness (PC) was equal to 0.61. The fe and fa were 109, 98, respectively, with a ratio of 1.11. The number of ancestors explaining 50% was 30. The Ne ranged 142.68 to 144.13. The average generation interval was 4.11 years. The mean of inbreeding coefficient in the inbred lambs was 2.55% and in the whole population was 1.26% with an increase of 0.09% per year and 0.87% in each generation. The AR of the total population was estimated as 2.27% with an incremental trend of 0.10% per year and 0.59% i...
Source: Small Ruminant Research - Category: Zoology Source Type: research