Preliminary Investigation on Genetic Diversity of Nigerian Native Goat Populations Based on Haemoglobin Polymorphism
Abstract
Abstract
Genetic diversity of three native goat populations in Maiduguri was determined based on Haemoglobin polymorphism. A total of 100 goats were studied comprising Borno white (53), Sokoto red (26) and West African Dwarf goat (21). Cellulose Acetate Electrophoresis procedures were adopted to assess Haemoglobin-types. Mendelian ratio for genotype inheritance was tested using chi-square ( ) test. Genetic distance was estimated from gene frequencies and dendrogram was drawn from genetic distance. Three Haemoglobin variants (Hb AA, AB and BB) under two codominant alleles (Hb A and B) were detected. Borno white and WAD had the three Hb variants while Hb BB was absent in Sokoto red. Borno white and WAD goat populations were in Hardy-Weinberg Equilibrium (HWE) while Sokoto red deviated significantly (P<0.05). Local inbreeding coefficients were negative (-0.587, -0.677 and -0.441) in the population. This indicates disassortative mating. Heterozygosity indices (HI, HS and HT) were high, indicative of rich genetic diversity. Heterozygote deficit within (FIS) and across (FIT) populations were negative suggesting high heterozygosity. Genetic differentiations were low (-6.0, 0.0, 0.00024%). Borno white had higher genetic distance (0.009165) with Sokoto red, and lower (0.000720) with WAD. Phylogenetic tree distinguished Sokoto red from other breeds. Borno white and WAD were clustered together indicating genetic relationship. From this study, it can be concluded that Hb AB was predominant and Sokoto red goat population has been badly affected by forces influencing genotype and gene frequencies.
Keywords: genetic distance, phylogenetic tree, population, diversity, Haemoglobin, goats
Abstract
Genetic diversity of three native goat populations in Maiduguri was determined based on Haemoglobin polymorphism. A total of 100 goats were studied comprising Borno white (53), Sokoto red (26) and West African Dwarf goat (21). Cellulose Acetate Electrophoresis procedures were adopted to assess Haemoglobin-types. Mendelian ratio for genotype inheritance was tested using chi-square ( ) test. Genetic distance was estimated from gene frequencies and dendrogram was drawn from genetic distance. Three Haemoglobin variants (Hb AA, AB and BB) under two codominant alleles (Hb A and B) were detected. Borno white and WAD had the three Hb variants while Hb BB was absent in Sokoto red. Borno white and WAD goat populations were in Hardy-Weinberg Equilibrium (HWE) while Sokoto red deviated significantly (P<0.05). Local inbreeding coefficients were negative (-0.587, -0.677 and -0.441) in the population. This indicates disassortative mating. Heterozygosity indices (HI, HS and HT) were high, indicative of rich genetic diversity. Heterozygote deficit within (FIS) and across (FIT) populations were negative suggesting high heterozygosity. Genetic differentiations were low (-6.0, 0.0, 0.00024%). Borno white had higher genetic distance (0.009165) with Sokoto red, and lower (0.000720) with WAD. Phylogenetic tree distinguished Sokoto red from other breeds. Borno white and WAD were clustered together indicating genetic relationship. From this study, it can be concluded that Hb AB was predominant and Sokoto red goat population has been badly affected by forces influencing genotype and gene frequencies.
Keywords: genetic distance, phylogenetic tree, population, diversity, Haemoglobin, goats
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