@article {10.3844/ajavsp.2021.56.61,
article_type = {journal},
title = {Influence of Different Freezing Curves on the Acrosome Integrity of Male Goat Sperm Cells},
author = {Lopes, Sofia Alexandra Fagundes and Rosa, Henrique José Duarte and Chaveiro, António and da Silva, Fernando Moreira},
volume = {16},
number = {1},
year = {2021},
month = {Feb},
pages = {56-61},
doi = {10.3844/ajavsp.2021.56.61},
url = {https://thescipub.com/abstract/ajavsp.2021.56.61},
abstract = {The aim of the present study was to evaluate the effect of three different freezing curves on male goat’s sperm viability and acrosome integrity. Semen was collected on three adult male goats in February (Azores, Portugal, latitude 38°39′N) using an artificial vagina and a female with induced heat. Three collection sessions were spaced of approximately 5 days. The study followed a factorial design of repeated measurements. After volume, sperm concentration and mass motility evaluation, live and dead spermatozoa (spz) were counted and acrosome integrity was evaluated by Flow Cytometry (FCM). In the meantime semen was frozen using three curves differing in the second cooling ramp rate (curve A = 25°C/min, curve B = 35°C/min and curve C = 45°C/min). After thawing, the percentage of live/dead sperm cells and the acrosome integrity were determined by FCM, using respectively Propidium Iodide (PI) and Pisum Sativum Agglutinin conjugated to Fluorescein Isothiocinate (FITC-PSA). By combining these two fluorochromes, the thawed semen was divided into: Live sperm with intact acrosome, unstained PI and unstained FITC-PSA (LL); live sperm with damaged acrosome, unstained PI and stained FITC-PSA (LR); dead sperm with intact acrosome, stained PI and unstained FITC-PSA (UL); dead sperm with damaged acrosome, stained PI and stained FITC-PSA (UR). Although different freezing curves did not significantly influence live sperm rate with intact (19.14±0.86% spz curve A, 17.72±0.86% spz curve B and 18.18±0.86% spz curve C) or damaged (0.44±0.04 % spz curve A, 0.38±0.04% spz curve B and 0.49±0.04% spz curve C) acrosome, a significant (P},
journal = {American Journal of Animal and Veterinary Sciences},
publisher = {Science Publications}
}