Avaliação do efeito das combinações de crioprotetores e da remoção do plasma seminal na criopreservação de sêmen caprino

• Autor(a) principal: Queiroz, Aline Francelina de
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/15424
• topic: Centrifugação; Congelação; Espermatozoide; Fosfolipase A; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

The objective of this study was to evaluate the effect of different cryoprotector extenders [Standard Skim Milk (SM), Standard Tris-Yolk egg (SE), Skim Milk Test (ST) and Tris-Yolk egg Test (TE)] and plasma seminal removal on kinetics and integrity parameters of cryopreserved goat semen. Four male goats (two Alpine and two Saanen) were used, which were submitted to semen collection with artificial vagina method, thrice per week, during two weeks, making up six pools of semen. Each pool was split in eight aliquots, four samples were diluted without removal of the seminal plasma - NC (non - centrifuged) in the different extenders and four samples submitted to the C - plasma centrifugation process by double centrifugation (1200g/10min). After dilution, they were gone packed in straws (0.25 mL), frozen and stored in cryogenic cylinder at -196 °C. Samples were thawed (37 °C/30s) and evaluated immediately and two hours post-thawing for sperm kinetics through the computerized spermatozoa system (CASA), plasma membrane integrity (iMP) and mitochondrial potential (MP) evaluated by epifluorescence microscopy. Total motility (TM) was reduced (p>0.05) in all no centrifuged groups; velocity average path (VAP), velocity in straight line (VSL) and velocity curvilinear line (VCL) was reduced (p>0.05) in the LPNC and LTNC groups; however higher values was observed in VAP, VSL and VCL to the centrifuged groups, with emphasis on the Yolk-egg extenders groups. On the other hands, the LP and LT extenders, centrifuged or non-centrifuged maintained the linearity (LIN), straightness (STR) and oscillation index (WOB). Extenders influenced the amplitude of lateral head displacement (ALH) and beat-cross frequency (BCF), with higher values (p<0.05) for the GPNC and GTNC groups. The iMP and MP did not differ (p>0.05) between extenders groups, though the SE and TE extenders, centrifuged or no centrifuged, presented higher iMP and lower values to PM. Thus, seminal plasma removal positively affects seminal evaluation parameters, and egg yolk extender is more efficient at protect against cryopreservation alterations and maintain desirable fertility characteristics after goat semen cryopreservation.