ابراهيم حسن صاحب الخفاجي

This study was conducted with the aim of determining the genotypes of the leptin gene and its relationship with total weight gain rates and the daily, relative and specific growth rates in 66 samples of common carp (Cyprinus carpio L). Results of Sequencing and Single Nucleotide Polymorphism-SNP showed three genotypes at site of 2092 CC, CT and TT, and distribution ratios of genotypes were 4.55, 12.12 and 83.33%, respectively, and the differences between these percentages were highly significant (P < 0.01). The allelic frequency of the allele was 0.11 in C genotype, while the allele frequency of T was 0.89. Results showed that there were no significant differences between the genotypes of the studied growth traits, the total weight gain rates in the genotype CC reached 45.66 g/fish, and in the genotype CT 42.25 g/fish, while in the genotype TT was 36.30 g/fish. The daily growth rates were 0.65, 0.60 and 0.51 g/day in the genotypes CC, CT and CT, respectively, and the relative growth rate was 47.29% in the genotype CC, and 44.58% in the genotype CT, while it was 39.87% in the genotype TT. The specific growth rates were 0.55, 0.52 and 0.46% /day in the genotypes CC, CT and TT, respectively.

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