Use of glutathione peroxidase and cysteine in Botu-Sêmen® and ACP-105® diluents on integrity of chilled equine spermatozoa / Uso de glutationa peroxidase e cisteína aos diluentes botusêmen® e ACP-105® na integridade de espermatozoides equinos refrigerados

ABSTRACT

Aiming to study the effect of glutathione peroxidase (GPx) and cysteine (Cis) addition in Botu-Sêmen® and ACP-105® diluents on integrity of equine spermatozoa, semen samples were cooling (14 C) and analyzed for total motility (TM), vigor, membrane integrity (iM) and acrosome (iAC), and mitochondrial membrane potential (MMP), after 0 (T0), 12 (T12) and 24 (T24) hours of cooling. Analysis of TM in T12 demonstrated that semen samples diluted in Botu-sêmen® (G1) and Botu-sêmen®+GPx+ Cis (G7) had higher (P 0.05) percentage than those diluted in ACP-105®+ Cis (G6). At T24, samples diluted in G7 had higher MT (P 0.05) than those in G2 and G6. Sperm vigor in T12 was higher (P<0.05) in samples diluted at G7 than in G2 and G6. At T24, the vigor of samples diluted G4 and G7 was higher (P<0.05) than inG2 and G6. No significant difference were observed to iM and MMP among groups, except to MMP at T0 was higher (P<0.05) in G1 than G7 and G8. At T24 the iAC parameter was higher (P<0.05) in the G6 than in G1. It can be concluded that GPx (5U) and Cis (5mM) in association preserves equine spermatozoa diluted in Botu-sêmen® at 14C during 24 hours.

RESUMO

Visando estudar o efeito da adição de glutationa peroxidase (GPx) e cisteína (Cis) aos diluentes Botu-Sêmen® e ACP-105® na viabilidade de espermatozoides equinos, amostras de sêmen foram refrigeradas (14 ºC) e analisadas quanto à motilidade total (MT), vigor, integridade de membrana (iM) e de acrossoma (iAc), e potencial da membrana mitocondrial (PMM), após0 (T0), 12 (T12) e 24 (T24) horas de refrigeração. A análise da MT evidenciou no T12 que as amostras de sêmen dos grupos Botu-sêmen® (G1) e Botu-sêmen®+GPx+Cist (G7) apresentaram maiores (P0,05) entre grupos, com exceção do PMM que no T0 foi maior (P<0,05) no G1 do que no G7 e no G8. A iAc no T24 foi maior (P<0,05) no G6 do que no G1. Conclui-se que a associação de GPx (5 U) e Cist (5 mM) preserva espermatozoides equinos diluídos em Botu-sêmen® refrigerados (14 oC) durante 24 horas.