Storage Conditions of Sperm Samples and Gametic Characterization by Sperm Head Morphometry in Drones (Apis mellifera).

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作者:Esteso Milagros Cristina, Toledano-Díaz Adolfo, Castaño Cristina, Higes Mariano, Martín-Hernández Raquel, López-Goya Agustin, De la Rúa Pilar, Martínez-Madrid Belén, Santiago-Moreno Julián
The present study aimed to evaluate an optimal method to transport and store drone sperm samples, as well as to characterize drone spermatozoa through sperm head morphometry. A total of 291 mature drones were used. We performed three experiments. In a first experiment, sperm variables were assessed under different incubation conditions (5 °C, 15 °C, and 37 °C with 5% CO(2)). Results showed that sperm viability was optimally maintained at 15 °C (p ˂ 0.05). In the second experiment, the supplementation of extender with catalase (200 UI) improved (p ˂ 0.05) the sperm viability and motility during liquid storage at different incubation times. Finally, a morphometric analysis of sperm head was made: length 5.13 µm, width 0.85 µm, area 3.78 µm(2), perimeter 15.01 µm, acrosome length 3.50 µm. The variability in sperm head morphometry was calculated by coefficients of variation (CV) within- and between-drones. The CV within-drone was higher than the CV between-drones for all morphometric parameters regardless of hive origin, indicating a high degree of sperm pleomorphism.

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