Vet Med - Czech, 2026, 71(1):1-9

Dairy bull sperm subpopulation behaviour in frozen-thawed semen across breed, temperature, and thawing timeOriginal Paper

F Sevilla ORCID...1,2, I Araya-Zuniga ORCID...2, JM Solis ORCID...2, C Corcini ORCID...3, P Cervantes-Acosta ORCID...4, A Hernandez-Beltran ORCID...4, R Molina-Montero ORCID...5, D Pichardo-Matamoros ORCID...6, A Valverde ORCID...2
1 Doctorado en Ciencias Naturales para el Desarrollo (DOCINADE), Instituto Tecnológico de Costa Rica, Universidad Nacional, Universidad Estatal a Distancia, Alajuela, Costa Rica
2 Laboratory of Animal Reproduction, School of Agronomy, Costa Rica Institute of Technology, Alajuela, Costa Rica
3 Veterinary School, Pelotas Federal University, Rio Grande do Sul, Brazil
4 School of Veterinary Medicine and Animal Husbandry, Veracruz University, Veracruz, México
5 Agricultural Production Program, School of Agronomy, Costa Rica Institute of Technology, Alajuela, Costa Rica
6 Animal Husbandry Engineering, National Agrarian University, Chontales, Nicaragua

Optimising dairy cattle reproduction with assisted reproductive technologies, such as artificial insemination, requires standardised semen handling and analysis. This study evaluated the kinematic structure of the spermatozoan subpopulation in frozen-thawed Holstein and Jersey bull semen doses under different thawing protocols. We used frozen semen doses taken from four bulls of each breed. Nine semen doses were collected from each animal, for a total of 72 cryopreserved doses. Straw thawing was performed at three temperatures (35 °C, 37 °C, and 40 °C) and three times (30 s, 40 s, and 45 s). Sperm kinematic patterns were evaluated using a CASA-mot system (ISAS®v1). Sperm kinematic variables for each breed, temperature, and thawing time identified four subpopulations. The analysis revealed an effect of breed and semen thawing protocols (P < 0.05) on sperm subpopulation distribution, sperm movement, and swimming patterns. Subpopulation analyses based on semen assessment are needed to further interpret the relevance and effect on fertility.

Keywords: cryopreservation; dairy cattle; reproduction; spermatozoa; sperm kinematics

Received: August 11, 2025; Revised: November 6, 2025; Accepted: November 7, 2025; Prepublished online: January 26, 2026; Published: January 28, 2026  Show citation

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Sevilla F, Araya-Zuniga I, Solis J, Corcini C, Cervantes-Acosta P, Hernandez-Beltran A, et al.. Dairy bull sperm subpopulation behaviour in frozen-thawed semen across breed, temperature, and thawing time. Vet Med - Czech. 2026;71(1):1-9.
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