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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.22.0228    [Accepted] Published online November 14, 2022.
Population structure and genetic diversity of German Angora rabbit through pedigree analysis
Abdul Rahim1,*  , K S Rajaravindra2  , Om Hari Chaturvedi1  , Sita Ram Sharma3 
1North Temperate Regional Station, ICAR- Central Sheep and Wool Research Institute, Garsa, Kullu (H.P.) 135141, India
2ICAR-Directorate of Poultry Research (DPR), Rajendranagar, Hyderabad 500 030, Telangana, India
3ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India
Correspondence:  Abdul Rahim, Tel: +91-7988712482, Fax: +91-01437-220163, Email: choudhary633@gmail.com
Received: 7 June 2022   • Revised: 26 July 2022   • Accepted: 7 June 2022
Abstract
Objective
The main goals of this investigation were to i) assess the population structure and genetic diversity and ii) determine the efficiency of the ongoing breeding program in a closed flock of Angora rabbits through pedigree analysis.
Methods
The pedigree records of 6145 animals, born between 1996 to 2020 at NTRS, ICAR-CSWRI, Garsa were analyzed using ENDOG version 4.8 software package. The genealogical information, genetic conservation index and parameters based on gene origin probabilities were estimated.
Results
Analysis revealed that, 99.09% of the kits had both parents recorded in the whole dataset. The completeness levels for the whole pedigree were 99.12%, 97.12%, 90.66%, 82.49% and 74.11% for the 1st, 2nd, 3rd, 4th, and 5th generations, respectively, reflecting well-maintained pedigree records. The maximum inbreeding, average inbreeding and relatedness were 36.96%, 8.07% and 15.82%, respectively. The mean maximum, mean equivalent and mean completed generations were 10.28, 7.91 and 5.51 with 0.85%, 1.19% and 1.85% increase in inbreeding, respectively. The effective population size estimated from maximum, equivalent and complete generations were 58.50, 27.05 and 42.08, respectively. Only 1.51% of total mating was highly inbred. The effective population size computed via the individual increase in inbreeding was 42.83. The effective numbers of founders (fe), ancestors (fa), founder genomes (fg) and non-founder genomes (fng) were 18, 16, 6.22 and 9.50, respectively. The fe/fa ratio was 1.12, indicating occasional bottlenecks had occurred in the population. The six most influential ancestors explained 50% of genes contributed to the gene pool. The average generation interval was 1.51 years and was longer for the sire-offspring pathway. The population lost 8% genetic diversity over time, however, considerable genetic variability still existed in the closed Angora population.
Conclusion
This study provides important and practical insights to manage and maintain the genetic variability within the individual flock and the entire population.
Keywords: Angora Rabbits; Diversity; Effective Population Size; Generation Interval; Genetic Structure; Inbreeding


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