Use of Aloe vera extract in swine semen criopreservation
Keywords:
Semen swine, freezing, conservation, cryoprotectant, Aloe veraAbstract
Egg yolk is used as a cryoprotective agent in semen freezing diluents for protection against thermal shock, despite the possibility of microbiological contamination. Authors search for Aloe vera, an alternative medium for the conservation of semen. The objective was to evaluate the use of the cryoprotectant Aloe vera in the cryopreservation of swine semen. We used 25 ejaculates, collected through the gloved hand technique. The samples were
diluted in the coolant diluent (10.0% egg yolk, Aloe vera 10, 20 and 30%) at 17 °C, freezing diluent (refrigerant diluent + glycerol 6.0%) at 5 °C and stored in vales. The vanes were evaluated for vigor, motility, membrane functionality, vitality, acrosome integrity and assisted semen analysis (CASA). The data were evaluated for normality, then analyzed using ANOVA and multiple comparisons, the analyzes were performed with a significance level of 5.0%, using the program R3.4.0. Descriptive statistics were used for data on vigor, motility and CASA. In the evaluation of thawed semen for membrane functionality, acrosome integrity and vitality, the highest values were found for the egg yolk samples (p<0.05), and among the samples that used Aloe vera, found significant differences between the different concentrations tested (p>0.05). The data of vigor, motility and CASA, of the samples using Aloe vera presented values of 0.0. The results showed that the different concentrations of Aloe vera did not exert the desired cryoprotective effect on the sperm cell, so it is understood that further studies are needed on its action on semen conservation, as well as a possible interaction with swine spermatozoa. On the other hand, it is believed that additional studies on the cooling curve of the porcine semen are still necessary, aiming at its cryopreservation.
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