Genetic Diversity Assessment in Iraqi Local Goat Breeds by Using Molecular Markers
2023
Awat Yousif | Mohammed Abdalla
Goats play a significant role in the economy of Iraq through livestock production, income generation, employment opportunities, and the conservation of valuable genetic resources. Genetic diversity of three Iraqi local goat breeds were studied by using two molecular markers, fifteen microsatellite (SSR) and fifteen RAP DNA markers. Individual blood samples were collected and individual genomic DNA were extracted from 30 Black, 10 Hybrid, and 20 Meriz goat breeds. PCR amplification was conducted. The results revealed that out of 15 SSR primers, 11 were amplified and showed 847 total bands, 53 were polymorphic with 6.58 percentage of polymorphic bands. All the fifteen RAPD primers amplified 6085 total bands, in which 273 were polymorphic bands with 4.33 percentage of polymorphic bands. Different unique bands were detected for each breed. Both SSR and RAPD gave moderate polymorphism 66.67% and 61.52%, respectively. Besides, this value was consistent with the moderate value of the mean of polymorphism information content 0.19 and 0.28, respectively. Meriz and Hybrid breeds revealed the longest genetic distance (0.114 and 0.316). While, Black and Meriz breeds revealed the highest closeness (0.956 and 0.831) for SSR and RAPD markers, respectively. Furthermore, the UPGMA dendrogram for both of SSR and RAPD markers classified the three goat breeds into two main clusters. The first one contained Black and Hybrid breeds. While, the second one contained only Meriz breed. The results of the current study will be helpful for future researchers as a key guide to better understanding the genetic relationships and breed differences in Iraqi goat breeds for planning strategies for the future genetic improvement program.
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