Abstract
Purpose
Using a rabbit model, we assessed the influence of sperm DNA longevity on female reproductive outcomes.
Methods
Semen was collected from 40 bucks, incubated at 38 °C for 24 h, and the rate of sperm DNA fragmentation (rSDF) was determined using the sperm chromatin dispersion assay. Males were allocated into high rSDF (>0.5 units of increase per hour) or low rSDF (<0.5 units of increase per hour) groups. High and low rSDF semen samples were sequentially artificially inseminated into the same doe to reduce female factor variability, and pregnancy outcomes were recorded.
Results
While there was no difference in SDFs between rSDF groups immediately after collection (T0), differences were significant after 2 h of incubation; SDFs determined at collection and rSDF behaved as independent characters (Pearson correlation = 0.099; P = 0.542). Following artificial insemination, the rate of stillborn pups was significantly higher in does inseminated by males with a high rSDF (14/21) compared to those with low rSDF (15/6); (contingency χ2 5.19; p = 0.022). The risk of stillborn when low rSDF rabbits were used for insemination was 0.16, but increased to 0.36 when high rSDF animals were used (odds ratio = 2.85; 95 % confidence interval = 1.4–2.7).
Conclusion(s)
Dynamic assessment of SDF coupled with natural multiple ovulation, high fecundity of the rabbit and control over female factor influence, provided a useful experimental model to demonstrate the adverse effect of reduced sperm DNA longevity on reproductive outcome.
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Acknowledgments
This research was supported by the Spanish Ministry of Economy and Competitiveness, MINECO (BFU-2013-44290-R).
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Sequential artificial insemination of the same naturally multi-ovulating female makes the rabbit a useful model for investigating the effect of sperm DNA longevity on reproductive outcome. Decreased sperm DNA longevity resulted in a diminished proportion of live offspring per pregnancy and an increased number of stillborn kittens.
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Johnston, S.D., López-Fernández, C., Arroyo, F. et al. Reduced sperm DNA longevity is associated with an increased incidence of still born; evidence from a multi-ovulating sequential artificial insemination animal model. J Assist Reprod Genet 33, 1231–1238 (2016). https://doi.org/10.1007/s10815-016-0754-9
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DOI: https://doi.org/10.1007/s10815-016-0754-9