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Genetic Diversity and Differentiation of Dromedarian Camel of India

Estimation of genetic variability and relationship among different livestock breeds is important for management of genetic resources for their sustainable utilization and conservation. This is more important when the livestock species, like camel, have shown a sharp decline in head count during the last decade. In the present study we estimated genetic variability and relationship among four camel breeds of India using 23 microsatellite loci. A total of 252 alleles were observed across all the four populations with mean number of alleles per locus as 8.04, 7.30, 6.39, and 7.43 for Bikaneri, Jaisalmeri, Kutchi, and Mewari breeds, respectively. The mean observed heterozygosity of the four breeds were 0.58, 0.57, 0.56, and 0.60 for Bikaneri, Jaisalmeri, Kutchi, and Mewari breeds, respectively and were lower than expected heterozygosity values. The mean estimates of F statistics were 0.227±0.044 (FIT), 0.157±0.038 (FIS), and 0.082±0.019 (FST). The values were significantly different from zero for all the three measures and point towards the existence of population structure and moderate differentiation in four camel breeds. The exact test also indicated significant population differentiation (P < 0.001). The analysis of molecular variance revealed 12% of the variation attributed to among populations and 88% within populations. Sixty-nine percent of the individuals could be correctly assigned using “leave one out” procedure. All the individuals of Mewari and 42 out of 44 Jaisalmeri were correctly assigned. The existence of strong population structure in Jaisalmeri and Mewari camel was further substantiated by Nei's standard genetic distance as well as interindividual allele sharing distance. Thus these two breeds owing to selection for specific traits are distinct from other camel breeds.