Timing of multiple ovulations in the ewe after treatment with FSH or PMSG with and without GnRH

摘要: Ovulation rate, median time to first ovulation, of all ovulations and from last ovulation were studied by repeated laparoscopy in Merino ewes. Treatments with FSH or PMSG significantly affected rate (8.4 +/- 0.81 7.3 1.21 respectively, P less than 0.05) (60 54 h respectively after progestagen sponge removal, 0.05). Differences the 48 h) (6 6 for respective treatments not significant. The synchrony both was adversely (1) occurrence premature before onset superovulation, (2) variability commencement (3) ovulation. Administration GnRH synchronized timing gonadotrophin treatments. This due a reduction period during which superovulation began interval + (45 at 16, 20 24 removal traits examined except rate. produced an equally good better that obtained 16 h. We suggest use embryo collection programmes appears justified is likely improve yields improved rates fertilization.