Differences between traditional and modern populations within cattle breeds: What do we not know?

Purpose: We reviewed the genetic differences between modern and traditional cattle breeds, emphasizing the evolution of modern cattle herds, particularly the Hereford breed. With this work, we sought to enhance our comprehension of bovine genomics by analyzing the interaction between traditional and modern cattle genetics, thereby informing future breeding and conservation strategies.

Sources: We reviewed the existing literature on genomic studies of cattle breeds and highlighted a dearth of information (except in a few cases) regarding the differences between traditional and modern populations within breeds.

Synthesis: According to the limited studies available, traditional populations serve as significant stores of genetic variety, which can later be introgressed into modern breeds to improve production, resilience, and adaptation to changing environments. However, information about this diversity is severely lacking in many breeds for which traditional populations exist.

Conclusions and Applications: We made the case for more extensive surveys of genomic differences within cattle breeds where ancestral and traditionally managed populations exist. These surveys could have substantial implications for sustainable livestock management and the enhancement of cattle breeds in response to ever-changing environmental and agricultural requirements. In particular, understanding the genetic changes involved in the development of modern breeds can assist in identifying adaptive loci present in traditional populations that are at risk of being lost through selective breeding.