Advances in Animal Breeding Genetics and Reproductive Biotechnology: Integrating Genomic Innovations for Sustainable Livestock Improvement

Abstract

Genetic improvement and reproductive efficiency are the two fundamental drivers of sustainable livestock production, directly influencing productivity, adaptability, and economic returns. During the past two decades, conventional breeding strategies have been transformed by advances in molecular genetics, genomics, and reproductive biotechnology. Traditional selection methods are now complemented by marker-assisted and genomic selection, while artificial insemination has evolved into a broader platform that includes sexed semen, ovum pick-up and in vitro embryo production (OPU-IVP), embryo transfer, cryopreservation, somatic cell nuclear transfer (SCNT), and genome-editing technologies. Together, these innovations have accelerated the identification, multiplication, and dissemination of genetically superior animals. This review provides a comprehensive overview of recent advances in animal breeding genetics and reproductive biotechnology, emphasizing their complementary roles in modern livestock improvement. It discusses the genetic foundations of breeding, the principles and applications of assisted reproductive technologies, and the integration of genomic information into breeding programs. Particular attention is given to marker-assisted and genomic selection, the advantages and limitations of reproductive biotechnologies, the emerging role of epigenetic regulation in fertility and phenotypic variation, and the growing potential of CRISPR/Cas9-based genome editing for the rapid introduction of desirable traits. A regional case study focusing on South Asian buffalo production demonstrates how these technologies can be adapted to resource-limited and smallholder production systems while conserving valuable indigenous genetic resources. Although remarkable progress has been achieved, widespread implementation remains constrained by technical, economic, regulatory, ethical, and infrastructural challenges. Future advances are expected to arise from the integration of multi-omics technologies, precision reproductive management, and affordable genomic tools tailored to locally adapted breeds. Collectively, these developments offer a practical pathway toward more productive, resilient, climate-adaptive, and sustainable livestock production systems worldwide.