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RESEARCH ARTICLE

Impact of bull age, sperm processing, and microclimatic conditions on the viability and DNA integrity of cryopreserved bovine sperm

Burcu Cinar A , Heinrich Bollwein A , Mathias Siuda A , Matthias Lautner B , Claus Leiding B and Eleni Malama https://orcid.org/0000-0003-1433-7336 A *
+ Author Affiliations
- Author Affiliations

A Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, Zurich 8057, Switzerland.

B Besamungsverein Neustadt a.d. Aisch e.V., Karl-Eibl-Straße 17-27, Neustadt a.d. Aisch 91413, Germany.

* Correspondence to: emalama@vetclinics.uzh.ch

Handling Editor: Marc Yeste

Reproduction, Fertility and Development 36, RD23219 https://doi.org/10.1071/RD23219
Submitted: 7 December 2023  Accepted: 11 April 2024  Published online: 7 May 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Seasonal microclimatic fluctuations can cause changes in sperm quality even in dairy bulls bred under temperate climate. These changes can vary between sires of different age and affect sperm freezability.

Aims

We aimed to evaluate the modulating effect of bull age and equilibration time before freezing on the seasonal pattern of sperm viability and DNA integrity post-thaw.

Methods

In the frame of systematic sperm quality control, we assessed the integrity of sperm plasma membrane and acrosome (PMAI) in 15,496 cryopreserved bovine batches, and the percentage of sperm with high DNA fragmentation index (%DFI) after 0 h and 3 h incubation at 38°C post-thaw (3 h) in 3422 batches. Semen was equilibrated for 24 h before freezing if collected on Monday or Wednesday and 72 h if produced on Friday. We investigated the effect of season, bull age, equilibration, and temperature-humidity index (THI) on the day of semen collection on sperm traits using mixed-effects linear models.

Key results

PMAI and %DFI (0 h and 3 h) deteriorated with increasing THI. The effect of THI on %DFI was detected with a 30-day time lag. Seasonal fluctuations of sperm quality were similar between young, mature, and older sires. Prolonged equilibration did not affect PMAI but was linked to elevated %DFI (3 h) in summer.

Conclusions

Extending equilibration from 24 to 72 h is compatible with commercial standards of bovine sperm quality post-thaw; however, it could interfere with the seasonal pattern of the latter.

Implications

Systematic monitoring of bovine sperm quality enables the prompt detection of stress factors related to microclimate and semen processing.

Keywords: bull, bull age, cryopreservation, DNA integrity, microclimate, season, sperm quality control, sperm viability.

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