ArticleThe Journal of reproduction and development2018
Cluster analysis reveals seasonal variation of sperm subpopulations in extended boar semen.
Article in The Journal of reproduction and development, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Dairy bull sperm subpopulation behaviour in frozen-thawed semen across breed, temperature, and thawing time.Veterinarni medicina · 2026Article
- Beyond swimming: emerging parameters for predicting the fertility of mouse spermatozoa.Lab animal · 2025Review
- Boar Sperm Motility Assessment Using Computer-Assisted Sperm Analysis: Current Practices, Limitations, and Methodological Challenges.Animals : an open access journal from MDPI · 2025Review
- Modulatory effect of MG-132 proteasomal inhibition on boar sperm motility duringFrontiers in veterinary science · 2023Article
- Single Fixed-Time Post-Cervical Insemination in Gilts with Buserelin.Animals : an open access journal from MDPI · 2021Article
- Kinematic Sub-Populations in Bull Spermatozoa: A Comparison of Classical and Bayesian Approaches.Biology · 2020Article
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Authors and funding
3 authors.
Funding
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Abstract
This study aimed to identify motile sperm subpopulations in extended boar semen and to observe the presumptive seasonal variation in their distribution. Data from 4837 boar ejaculates collected over a two-year period were analyzed in terms of kinematic parameters by Computer Assisted Sperm Analysis (CASA). Individual sperm data were used to determine subgroups of motile sperm within the ejaculates using cluster analysis. Four motile sperm subpopulations (SP) were identified, with distinct movement patterns: SP1 sperm with high velocity and high linearity; SP2 sperm with high velocity but low linearity; SP3 sperm with low velocity but high linearity; and SP4 sperm with low velocity and low linearity. SP1 constituted the least overall proportion within the ejaculates (P < 0.05). Season of semen collection significantly influenced the different proportions of sperm subpopulations. Spring was characterized by similar proportions of SP1 and SP4 (NS) and higher proportions of SP3. Summer brought a decrease in both subgroups containing fast sperm (SP1 and SP2) (P < 0.05). During autumn, increases in SP2 and SP4 were recorded. Winter substantially affected the proportions of all sperm subpopulations (P < 0.05) and SP2 became the most represented subgroup, while SP1 (fast and linear) reached its highest proportion compared to other seasons. In conclusion, extended boar semen is structured in distinct motile sperm subpopulations whose proportions vary according to the season of collection. Summer and autumn seem to have a negative impact on the fast and linear subpopulation. Cluster analysis can be useful in revealing differences in semen quality that are not normally detected by classical evaluation based on mean values.
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