Population structure of Lori-Bakhtiari sheep in Iran by pedigree analysis
The objective of this study was to describe the population genetic structure and evaluate the state of conservation of genetic variability of Lori-Bakhtiari sheep in Iran. As such, pedigree information of 10,644 lambs lambed from 1989 through 2016 in the stud flock of Lori-Bakhttiari sheep was included in the analysis. Our first goal was to estimate mean and variance of family size across sires and dams using pedigree data. Our second goal was to estimate population structure in Lori-Bakhtiari sheep including estimation of 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 progenies per ram and ewe in their lifetime were 26.44 (15 to152) and 3.6 (1 to 15), respectively. The mean and variance of family size of sires differ across years. The pedigree completeness (PC) was equal to 0.61. The fe and fa were 109 and 98, respectively with a ratio of 1.11. The number of ancestors explaining 50% of genetic diversity was 30. The Ne also varied from 142.68 to 144.13 during the study period. The average generation interval was 4.11 years. The mean inbreeding coefficient was 2.5% in inbred lambs and 1.26% in whole population with an annual increase of 0.09% per year and 0.87% per generation. The AR of t...
Source: Small Ruminant Research - Category: Zoology Source Type: research