Xinjiang donkey genomics study sharpens breed conservation picture
Bottom line
A new genomic study in Animals maps the genetic structure of two indigenous donkey breeds from Xinjiang, China, the Hetian Gray donkey and the Xinjiang donkey, and identifies selection signals tied to their visible differences in body size and coat color. The study analyzed whole-genome data from 60 newly sequenced animals alongside 155 global reference genomes, adding to a growing body of work showing that Hetian Gray donkeys are genetically close to Xinjiang donkeys, but have undergone distinct selection around production and phenotype-related loci. Earlier genomic work has pointed to body-size genes including LCORL, NCAPG/NCAPC, TBX3, and FAM184B in comparisons involving these breeds, while a separate 2026 multiomics study linked the Hetian Gray donkey’s gray coat to increased ASIP expression driven by a 30-base-pair intronic deletion. (bmcgenomics.biomedcentral.com)
Why it matters: For veterinary professionals and animal breeding programs, the value here is less about immediate clinical change and more about breed stewardship. Genomic resolution can help conservation programs distinguish shared ancestry from true breed-specific traits, reduce inbreeding risk, and support more targeted selection in populations that may already be under pressure from mechanization, shrinking herd sizes, and uneven commercial demand. Reviews of China’s donkey genetic resources have warned that many local breeds face endangerment pressures, making data on diversity, ancestry, and selected traits more useful for breeding policy, reproductive planning, and long-term health management. (bmcgenomics.biomedcentral.com)
What to watch: Watch for follow-up work that validates specific candidate genes in larger herds and translates these findings into practical conservation and breeding strategies for Xinjiang’s local donkey populations. (bmcgenomics.biomedcentral.com)
Key facts
- Study type
- Genomic study
- Journal
- Animals
- Breeds studied
- Hetian Gray donkey and Xinjiang donkey
- Region
- Xinjiang, China
- Sample size
- 60 newly sequenced animals, plus 155 global reference genomes
- Main finding
- The breeds are genetically close, but show distinct selection signals tied to body size and coat color
- Trait context
- Hetian Gray donkeys are larger-bodied and gray-coated, while Xinjiang donkeys are generally smaller-bodied
- Candidate genes
- Earlier work highlighted TBX3, LCORL, NCAPG/NCAPC, and FAM184B
- Coat color gene
- A 2026 multiomics study linked gray coat color to ASIP expression and a 30-base-pair intronic deletion
A newly published genomics paper in Animals adds another layer to what researchers know about two of Xinjiang’s best-known indigenous donkey populations: the Hetian Gray donkey and the Xinjiang donkey. Using whole-genome sequencing from 60 newly sampled animals plus 155 global reference genomes, the study examines how the two breeds are related and where artificial selection may have shaped their differences in traits such as body size and coat color. That makes it part of a broader push to use genomics not just to describe local breeds, but to support their conservation and managed improvement. (pubmed.ncbi.nlm.nih.gov)
The background matters here. Hetian Gray donkeys are a distinctive local breed from southern Xinjiang, recognized for larger body size, gray coat color, and adaptation to a dry, hot environment, while the more common Xinjiang donkey is generally smaller-bodied. Earlier work has suggested that the Hetian Gray donkey’s population has declined over time as agricultural mechanization reduced reliance on working donkeys, increasing the urgency around conservation. A 2025 BMC Genomics study found that Hetian Gray donkeys cluster closely with Xinjiang and Guanzhong donkeys, and concluded that Xinjiang and Guanzhong animals likely contributed to the breed’s formation, rather than local wild asses. (bmcgenomics.biomedcentral.com)
That earlier study also helps frame the new report’s likely significance. In the BMC Genomics analysis, selection scans comparing Hetian Gray and Xinjiang donkeys highlighted genes previously associated with body-size biology, including TBX3, LCORL, NCAPG/NCAPC, and FAM184B. Separate work on Chinese indigenous donkeys has likewise linked LCORL and NCAPG to rapid growth and larger stature, reinforcing the idea that body-size divergence between local donkey breeds is not just visible in the field, but traceable in the genome. (bmcgenomics.biomedcentral.com)
Coat color is another major part of the story. While the article topic focuses on genetic structure and selection signals, newer mechanistic work gives useful context for one of the Hetian Gray donkey’s defining features. A 2026 multiomics study of 175 domestic donkeys identified the ASIP locus as the top candidate associated with the gray coat phenotype and reported a 6.17-fold increase in ASIP expression in Hetian Gray donkeys. The authors also identified a 30-base-pair deletion in the gene’s second intron that increased transcriptional activity in functional assays, offering a plausible molecular explanation for the breed’s hypopigmented gray hair coat. (pubmed.ncbi.nlm.nih.gov)
Direct outside commentary on this specific Animals paper appears limited so far, but the broader industry and academic reaction around donkey genomics has been consistent: these studies are increasingly being framed as conservation tools, not just breeding tools. A recent review of donkey genetic resources noted that more than half of China’s 24 indigenous donkey breeds are considered under some degree of endangerment, and highlighted how genomic data can clarify diversity, resilience, and inbreeding risk across local populations. That context is especially relevant for regional breeds with narrow geographic distribution and distinctive phenotypes, like the Hetian Gray donkey. (mdpi.com)
Why it matters: For veterinary professionals, this is a population-health and breed-management story. Genomic studies like this can inform conservation breeding, reproductive decision-making, and disease-risk monitoring by identifying how much diversity remains within small or specialized populations. They may also help separate desirable production traits from linked risks if intense selection has narrowed the gene pool. In practice, that means veterinarians working with breeding farms, conservation herds, or regional livestock programs may increasingly be asked to interpret genomic information alongside phenotype, fertility, adaptation, and welfare data. (bmcgenomics.biomedcentral.com)
There’s also a translational angle. Although these findings are not immediately practice-changing in the clinic, they support more evidence-based breeding strategies in donkeys, a species that has historically received less genomic attention than cattle, pigs, or horses. As more candidate loci are validated, the field could move toward marker-assisted conservation and selection programs that preserve local adaptation while avoiding unnecessary loss of diversity. (pubmed.ncbi.nlm.nih.gov)
What to watch: The next step is likely functional follow-up, especially replication of selection signals in larger cohorts and integration with phenotype records for growth, fertility, adaptation, and coat traits. It will also be worth watching whether these genomic findings are incorporated into local conservation policy or breeding frameworks in Xinjiang, where earlier studies have already argued that efficient action is needed to preserve the Hetian Gray donkey. (bmcgenomics.biomedcentral.com)