Análises de membrana plasmática, acrossoma e mitocôndria de espermatozoides ovino após criopreservação com adição do ácido fólico no meio Tris-gema / Plasma membrane, acrosome and mitochondria analysis of sheep sperm after cryopreservation with addition of folic acid in the tris-yolk medium

ABSTRACT

Folic acid is closely linked to cobalamin, which is a carrier of hydroxymethyl and ant groups. The objective of this work was to evaluate the effect of adding folic acid to the TRIS-yolk diluter and possible effect on the membrane, mitochondria and acrosome of sheep sperm after thawing the semen. There were six sheep and seven collections of each animal in sessions between 48 and 72 hours. After collection and analysis, the semen samples were mixed and submitted to the formation of a pool. Diluted in TRIS-yolk medium and divided into 3 groups; Group control; Group 2 10,000µM of folic acid and in Group 3 5000µM of folic acid. Subsequently, the semen samples were packaged in 0.25mL straws and processed in a semen freezing machine. After a few days, the semen was thawed and evaluated plasma membrane integrity, acrosome function and integrity. They were analyzed using an analysis of variance (ANOVA) followed by the Newman-Keuls test, using SAS. The additionof a micronutrient with potential antioxidant action in the semen indicates that it can reduce the action of free radicals that alter the plasma membrane and sperm DNA. The evaluation of the plasma membrane integrity, mitochondrial activity and the acrosome integrity of post-thawed sperm were not significantly different between the groups evaluated. Thus, it is concluded that the addition of folic acid in concentrations of 5000µM and 10000µM to the TRIS-yolk seminal diluter does not significantly influence the variables evaluated in this experiment.