More research on IGFBP-3 gene of Egyptian endogenous livestock species is required for detection of polymorphism, comparison of gene sequencing and tracing the evolutionary relatedness for the gene sight among groups and breeds of farm animals within and between species. Relating the obtained results to the performance of the animals for the important economic traits will help to adapt applicable combined traditional and molecular selection programs and building a link between the gene differentiation and performance.

Ahmed A. Saleh, MSc; Genetic Studies on small ruminant at Alexandria University, MBA; Business Economics at Cairo University. Assistant lecturer at Faculty of Agriculture, Alexandria University, Egypt. Ph.D. student at Southwest University, Chongqing, China.