Qualidade do sêmen equino criopreservado com L-acetil-cisteina

• Autor(a) principal: Francisco Júnior, Arthur
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/4034
• topic: Espermatozóides; Integridade de membranas; Mangalarga marchador; Motilidade; Mangalarga marchador; Membrane integrity; Motility; Sperm; MEDICINA VETERINARIA::REPRODUCAO ANIMAL

This study was conducted to evaluate the effect of adding L-acetyl-cysteine (CIS) as anti oxidant agent to extender used for sperm cryopreservation of equine Mangalarga Marchador. Three semen samples from seven healthy stallions were obtained by artificial vagina, diluted in commercial extender and distributed into two treatments: control without addition and CIS, containing the antioxidant concentration of 2.5 mM. After the stabilization period, the samples were filled into 0.5 mL straws and subjected to cryopreservation protocol manually. Sixty days after the samples were thawed and evaluated in vitro by means of computerized analysis of sperm kinetics (CASA) and the evaluation of the integrity of plasma and acrosomal membranes by fluorescent probes. Regarding the kinetic variables related to sperm was found that in samples supplemented with CIS percentage of total and progressive motility (TM) (MP) was higher (P <0.01) compared to control samples (23.95±3 , 33 X 11 .38±2.35 and 4.66 ± 0.84 X 2.04 ± 0.36, respectively), but variable for straightness (STR) and linearity (LIN) the percentages were highe r (p ≤ 0.01) for the control samples (86.95 ± 1.02 X 82.28 ± 1.02 and 49.85 ± 1.32 X 45.19 ± 1.17, respectively). As those related to the integrity of the membranes of the sperm variables was superior (P <0.05) in the number of sperm with intact acrosome reaction (ICRA) in the samples compared to those CIS Control (4.7 ± 1.6 x 0.8 ± 0.2, respectively). The results suggest that the addition of acetyl-L-cysteine concentration of 2.5 mM in the diluent medium before cryopreservation can improve both the motility as the integrity of the sperm plasma membrane equine Mangalarga Marcher. More studies should be done to confirm this effect in vivo.