Bull sperm DNA methylation clock links epigenetic age to semen traits
Researchers built a DNA methylation clock for bull sperm cells that predicted biological age and correlated epigenetic age acceleration with semen quality traits; this is an abstract of a study in Holstein stud bulls. [1]
Automatic summary · not editorially reviewed
The key findings
An epigenetic clock for bull sperm cells was developed using whole-genome and reduced representation bisulfite sequencing on Holstein stud bulls of different ages. [1]
The clock predicted biological age of bull sperm cells with high accuracy, and epigenetic age acceleration correlated with fresh semen motility, frozen semen abnormality rate and testicular circumference. [1]
The authors established a cross-species human-bull sperm cell epigenetic clock. [1]
The source at a glance
- Study type / format
- Abstract of a study developing a DNA methylation clock
- Population / context
- Holstein stud bulls of different ages
- Summary based on
- Study abstract
- Original publication
- July 2, 2026
Holstein stud bulls and sperm methylation clock
The study concerned aging as a factor in semen quality and fertility in bulls. The researchers developed an epigenetic clock for bull sperm cells using whole-genome bisulfite sequencing and reduced representation bisulfite sequencing on samples from Holstein stud bulls of different ages. They identified age-specific CpG sites and distinct DNA methylation patterns associated with different age stages.
Supporting source [1]
Predicted biological age and semen trait correlations
The clock showed high accuracy in predicting the biological age of bull sperm cells. Epigenetic age acceleration correlated significantly with semen quality traits: fresh semen motility, frozen semen abnormality rate and testicular circumference. The authors also explored transmembrane transport and other pathways in sperm cell aging and established a cross-species human-bull sperm cell epigenetic clock.
Supporting source [1]
Abstract-only scope of the bull sperm clock
This explainer is based only on the abstract; the full text was not reviewed. The abstract reports correlations, not causes, between epigenetic age acceleration and semen traits. It does not give sample size, follow-up or validation details, and the proposed clock is a research tool for livestock reproductive management, not a validated product.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Sample size, follow-up and validation details are not reported, and the reported links are correlations, not causes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Li W, Tang Y, An S, Wang J, Feng X, Chen S, Yu Y. · europepmc.org · July 2, 2026