The article discusses the complexities of horse breeding, emphasizing that both linebreeding and inbreeding increase genetic homozygosity, reducing diversity and concentrating both desirable traits and hidden vulnerabilities. While linebreeding is often viewed more favorably as a strategic reinforcement of excellence, biologically it functions similarly to inbreeding by repeating ancestors and narrowing the gene pool. Modern reproductive technologies and pedigree culture have accelerated this process, spreading the genetics of a few influential sires widely and increasing the risk of genetic disorders such as connective-tissue diseases, muscle defects, immune vulnerabilities, and sensitive temperaments.

The piece highlights that genetic vulnerabilities often manifest only after generations, influenced by environmental factors and management practices. Tools like COI and ROH now reveal the true extent of genetic bottlenecks hidden by traditional pedigree narratives. The ethical concern raised is that breeding for fashion or performance often sacrifices long-term health and resilience. The article calls for a shift from glorifying repeated bloodlines toward prioritizing genetic diversity to safeguard the vitality and integrity of horses for future generations.