title: Time-dependent ovulation-blocking effect of ether anesthesia differs from pentobarbital in rats.
abstract: Time-dependent ovulation-blocking effect of ether anesthesia was investigated using female Wistar-Imamichi rats showing a 4-day cycling rhythm. A 6-hr (1400-2000) and 8-hr (1400-2200) anesthesia with ether vapor on proestrus caused ovulation blockade in 85% and 100% of the rats, respectively. On the other hand, pentobarbital injections at 1400 and 1500 completely blocked the spontaneous ovulation, while the injections at 1600 and 1700 did not. Ether (1400-2000) and pentobarbital anesthesia decreased the mean serum LH levels at 2000 on proestrus. The LH levels were 13.26 ng/ml for the control, 0.36 ng/ml for the ether group and 0.56 ng/ml for the pentobarbital group, respectively. These findings indicated that ether and pentobarbital similarly suppressed the LH surge, but difference between ovulation-blocking effects by ether and pentobarbital is possibly due to factor(s) other than suppression of the LH surge.
authors.affiliation: Institute for Experimental Animals, Tohoku University School of Medicine, Sendai, Japan.
authors.forename: C Y
authors.initials: CY
authors.lastname: Kim
authors.forename: K
authors.initials: K
authors.lastname: Wakabayashi
authors.forename: T
authors.initials: T
authors.lastname: Nobunaga
mesh_terms: D000769:Anesthesia, Inhalation; D000818:Animals; D004986:Ether / Q000494:pharmacology*; D005260:Female; D007274:Injections, Intraperitoneal; D007986:Luteinizing Hormone / Q000097:blood; D010060:Ovulation / Q000187:drug effects*; D010424:Pentobarbital / Q000494:pharmacology*; D011359:Proestrus; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors
chemical_list: D004986:Ether; D007986:Luteinizing Hormone; D010424:Pentobarbital