RESUMO
This study investigated the effects of supplementing Lake extender with cysteamine (CYS) on rooster semen quality in cold storage and it's fertility performance. Semen samples were diluted with Lake extender supplemented with different concentrations of CYS (0, 1, 2, 4 and 8 mM) and were cooled and stored at 5 °C for a period of 46 h. Motility, membrane functionality, viability, lipid peroxidation, and mitochondria membrane potential were evaluated at 0, 23 and 46 h of storage. Fertility was assessed at 23 h of storage. Although at the beginning time (0 h), parameters were not affected, 1 mM of CYS improved (P ≤ 0.05) total motility, progressive motility and mitochondria membrane potential during 23 and 46 h storage. Moreover, 1 and 2 mM CYS improved (P ≤ 0.05) membrane functionality and viability compared to other groups. Lipid peroxidation was lower (P ≤ 0.05) in samples diluted with 1 and 2 mM CYS compared to the others. Artificial insemination with 23-hrs cooled-stored semen produced the higher (P ≤ 0.05) fertility rate in groups received 1 and 2 mM CYS compared to the control group. In conclusion, addition of 1 and 2 mM CYS to the extender could be helpful to protect rooster semen against structural and functional damages of cooling storage process.
