06/17/2026
For my Breeder friends…🤔 things to think about.
Here's something I read this week. It outlines the state of our breed. I listed a couple of summary paragraphs that highlight what I've been sharing for the last few years.
Effective Population Size (Ne) in Dog Breeds
By Dan Roach, Operator, Just Behaving
"It is a directional warning about how the gene pool will travel if management does not change."
"Golden Retriever analyses have produced concerning figures depending on method and reference pedigree. Across several peer-reviewed demographic datasets, Golden Retriever (Ne) estimates have landed well below 100, and in some datasets in the 40 to 80 range when calculated from linkage-disequilibrium decay or pedigree-based methods."
"The exact number varies by method and dataset, but the overall message does not: the breed behaves genetically like a much smaller population than its public popularity suggests. A dog breed that produces tens of thousands of puppies per year worldwide is still a small genetic pool if a narrow set of lines is doing most of the contributing."
"Why low Ne is a direction, not a fate
That matters because Ne links directly to drift, allele loss, and inbreeding accumulation. Smaller effective populations lose rare alleles faster. They fix neutral alleles more quickly by chance. They accumulate relatedness more rapidly between any two randomly chosen dogs. They have less room to absorb recessive disease discoveries without narrowing the gene pool further. In other words, low Ne is not just a descriptive number. It is a directional warning about how the gene pool will travel if management does not change."
"The good news is that Ne is a direction, not a destiny. A breed community that recognizes the problem can reverse course by deliberately broadening which lines are used, avoiding the worst of the popular-sire dynamics, and using imported or rediscovered bloodlines where the breed structure allows it. The timescale for recovery is measured in generations rather than litters, but the trajectory is responsive to choice. Breeds that have committed to diversity-aware stewardship programs have measurably improved their Ne estimates over time, and breeds that have ignored the problem have measurably worsened. Neither outcome is automatic."
How to fix a low Ne? Same story I've shared multiple times-
Avoid Popular Sire Syndrome
Balance Breeding gender Ratios
Incorporate Diverse Lineages
Utilize Frozen Semen
Leverage Genetic Databases
Shorten Generation Intervals
