Akademik Veri Yönetim Sistemi
KAFKAS UNIVERSITESI VETERINER FAKULTESI DERGISI, cilt.16, sa.3, ss.463-468, 2010 (SCI-Expanded)
To evaluate the superovulatory response after synchronization using progesterone and oestradiol valerate, a total of 19 Brown Swiss cows were randomly allocated into two groups. Control cows (n=9) were superovulated with FSH (total: 400 mg), from d 10 to 13 (oestrus 0), using twice daily injections with decreasing doses (4, 4, 3, 3, 2, 2, 1, 1 ml). Treatment cows (n = 10) were received ear implants containing 3 mg norgestomet for 9 days at random stage of the oestrus cycle, and treated intramuscularly with 3 mg norgestomet + 5 mg oestradiol valerate at the time of implant insertion. On day seven of the implant insertion, FSH was injected over a 4-d period described in the control group. D-cloprostenol was injected to cows in both groups with the 5(th) FSH injections. Animals in both groups were inseminated 12 and 24 h after the onset of oestrus. Seven days after the second insemination, the ova/embryos were collected. There was no significant difference between the groups for last FSH injection-oestrus intervals, the mean numbers of corpus luteum, total ova/embryos, grade 1, 2 and 3, transferable and degenerated embryos and unfertilized ova and recovery rate (P>0.05). The results confirmed that progesterone + oestradiol valerate injection at the time of insertion of an ear implant for 9 days, regardless of the stage of the oestrus cycle, can be used as a pretreatment for superstimulation started on day 7 of the implant insertion in Brown Swiss cows.