Nulear maturation kinetcs in vitro of buffalo oocytes

Abstract

To evaluate the kinetics of the in vitro maturation of buffalo oocytes, 1.619 oocytes with compact cumulus oophorus were cultivated in different treatments: T1 - TCM 199 with 10% of bovine foetal serum (BFS) (basic medium); T2 - Medium basic and granulosa cells (GC); T3 -Basic medium, GC, 10 IU of eCG and 10 IU of hCG; T4 - Basic medium , 10 IU of eCG, 10 IU of hCG and 1 µg 17b-estradiol / ml, in times 14 to 17 h, 20 to 22 h, 23 to 25 h, 26 to 28 h, 29 h and 32 h of cultivation in CO2 incubator at 5% and temperature of 38,5ºC. In the treatment 1, it was observed that 81,83%, 69,61%, 65,88%, 60,28%, 64,98% and 67,67% of the oocytes restarted the meiosis; with the treatment 2, rates of oocytes restart of the meiosis were of 76,06%, 72,06%, 69,78%, 68,12%,74,97% and 89,96%; with the treatment 3 rates were of 83,59%, 78,86%, 77,49%, 82,4%, 72,92% and 81,06% and with the treatment 4 the rates were of 95,0%, 91,82%, 93, 17%, 91,65%, 92,09% and 74,99% in the times from 14 to 17 h, 20 to 22 h, 23 to 25 h, 26 to 28 h, 29 h and 32 h of culture, respectively, could be concluded that the supllemented medium provides larger rates of restarted of the meiosis in smaller time, as well as the increase in the time of cultivation it can take to largest rates of degeneration.