Genetic blood markers in Arabian, Barb and Arab-Barb horses in Morocco.

This research investigated the gene frequencies of 16 blood group and protein polymorphism loci in three horse breeds in Morocco (Arabian, Arab-Barb, and Barb) and used this information to calculate various genetic distance metrics. Among the breeds, Arabian horses showed lower genetic variability, whereas Arab-Barb and Barb horses had higher, similar variability. Barb and Arab-Barb horses exhibited the shortest genetic distance. The study also concluded that the 16 loci tested are highly effective for establishing incorrect paternity in these breeds.

Analysis of Gene Frequencies and Genetic Distance

• The article focused on gene frequencies for the Arabian, Arab-Barb, and Barb horse breeds in Morocco at 16 distinct blood group and protein polymorphism loci. These loci are A, C, D, K, P, Q, U, Al, Gc, Es, A1B, Tf, PGD, PGM, GPI, and Pi.
• The genetic information gathered was used to compute variables like average heterozygosity (h), Nei’s standard genetic distance (DN), and the probability of exclusion (PE). These metrics provide insight into the disparities and similarities between the genetic profiles of the different horse breeds.

Heterozygosity and Genetic Distance Metrics

• In terms of variability expressed as average heterozygosity, the Arabian breed showed the lowest rate (0.330 +/- 0.066). This suggests that Arabian horses have a relatively lower genetic diversity in their gene pool.
• On the other hand, the Arab-Barb (0.413 +/- 0.071) and the Barb (0.414 +/- 0.070) showed higher and almost identical levels of variability, signifying greater genetic diversity within these breeds.
• The comparison of the Nei’s standard genetic distance (a metric that tells about the genetic differentiation between populations) displayed the shortest genetic distance between the Barb and Arab-Barb breeds. This indicates a close genetic relationship between these breeds.

Applications of the Study

• The research findings suggest that the 16 loci could be at least 95% effective in identifying incorrect paternity in these breeds. This feature has significant applications in breeding programs and conservation efforts, helping determine the lineage of the horses and maintain breed purity.
• The genetic profiling of Barb and Arab-Barb breeds also revealed some rare genetic variants, perhaps of interest considering European and American breeds. These notable variants include Dcfgkm, Ddekl, Es-N, Tf-A, and Pi-W. Further research could examine how these unique genetic variants influence the breeds’ traits or characteristics.