50 BOVINE SPERM DEATH KINETICS: TEMPORAL CHANGES IN PRODUCTION OF REACTIVE OXYGEN SPECIES AND PLASMA MEMBRANE INJURY OF DAIRY AND BEEF FROZEN-THAWED SEMEN
Notice bibliographique
Résumé
The extent of changes in sperm structure and function affect the success of fertilization ultimately during the pathway to ovum in the female reproductive tract. The success of AI with frozen-thawed semen varies in dairy and beef breeds of bovine because of differed alterations in sperm during transport in female tract after insemination. To our knowledge, no report is available comparing the changes in dairy and beef sperm leading to death in female tract. Therefore, this study was aimed to investigate the changes in motility, generation of reactive oxygen species (superoxide and hydrogen peroxide), and their relation to sperm death [asymmetry (apoptosis) and rupture of plasma membrane] of dairy and beef frozen-thawed semen during incubation at 37°C for 24 h. This incubation was aimed to mimic the environment of female reproductive tract. Frozen dairy semen (n = 4 bulls) was procured from a Canadian breeding station, whereas beef semen was collected from breeding beef bulls (n = 3; 5 replicates), diluted with Tris-based extender (composition was same as used in dairy semen), cooled to +4°C over 90 min, and cryopreserved by programmable freezer using standard rate as used in dairy semen. Two straws per replicate were thawed at 37°C from both types of semen, pooled separately, and incubated at 37°C for 24 h in capped tubes. Each pooled semen sample was evaluated for motility with CASA, superoxide (O2–, and hydrogen peroxide (H2O2) radical using HE/YoPRO and H2DCFDA/PI assay, respectively, and asymmetry of plasma membrane using YoPRO/PI assay through flow cytometric analysis at 0, 2, 4, 6, 12, and 24 h of incubation. The MIXED procedure of SAS (SAS Institute Inc., Cary, NC, USA) was used to analyse the data as 2 × 6 factorial model for 2 types of semen (dairy and beef) and 6 time points using time as repeated measure. A threshold limit of 30% was considered for motility and live sperm to get optimum fertility. Sperm motility remained higher (P < 0.05) than threshold limit till 6 h in dairy (50.95 ± 2.62%) and 2 h in beef semen (30.28 ± 6.95%). Dairy semen possessed more (P < 0.05) nonapoptotic sperm without O2– (HE–/YoPRO–) till 6 h of incubation than beef semen. The increase in apoptotic sperm containing superoxide radical (HE+/YoPRO+) over time was more (P < 0.05) in beef semen till 6 h of incubation. The rise in dead sperm containing H2O2 (H2DCFDA+/PI+) was recorded more in beef than in dairy semen until 6 h of incubation. Live sperm without apoptosis (YoPRO–/PI–) were higher until 24 h in dairy (49.36 ± 4.56%) compared with beef semen (24.89 ± 3.85%), whereas viable sperm with apoptosis (YoPRO+/PI–) were found similar in both types of semen over time. In conclusion, dairy frozen-thawed semen possessed more live sperm without reactive oxygen species (superoxide and hydrogen peroxide) until 6 h of incubation than did beef semen. The decrease in superoxide radical was more in dairy than in beef semen. Dead and apoptotic sperm increased more in beef frozen-thawed semen over time during incubation. This inference suggests performing the insemination late near ovulation with beef frozen-thawed semen because of less viable life than dairy semen.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».