81) in the uterine antimezometrial epithelium of rats in the proestrus
group compared with mezometrial region (275.
Remaining adult F (1) females were bred to age-matched control F (1) males at 7-8 weeks of age, on the night of proestrus
(determined by vaginal cytology).
Fertility Studies: Male rats which had been treated for 6 weeks were cohabited with untreated parous proestrus
female albino rats at a ratio of 1:2.
Pregnancy was induced by overnight caging of a proestrus
female with a male of proven fertility.
smears were deficient in leukocytes and contained few to many clustered basophilic epithelial cells, few nucleated epithelial cells, and increasing bacteria.
Consistently, Kimura (1994) showed that intravenous infusion of bicuculline, a GABAA receptor antagonist, on the morning of proestrus
induced a premature surge-like secretion of LH (23).
Neuropeptide Y potentiates luteinizing hormone (LH) releasing hormone-stimulated LH surges in pentobarbital proestrus
Second estrus was defined as the day on which a smear indicating estrus fell within a run of smears clearly showing the correct cyclic sequence of proestrus
, estrus, metestrus, and diestrus.
De and Wood (1990) reported that quantitative differences in macrophages were not important in the uteri of mice at proestrus
, estrus and diestrus, but the distribution of these cells could change in the tissue during the estrous cycle, with the greatest numbers in the subepithelial stroma in proestrus
Animals that had repeated cycles of proestrus
, estrus, and diestrus I and II, in that order, were called "regular cyclers.
Vaginal smear data showed that Aroclor 1221 rats had fewer estrus and proestrus
days than diestrus days relative to vehicle animals, suggesting some qualitative difference in estrous cyclicity.
During fetal life in males and females, pregnancy, or proestrus
in females, estradiol levels are significantly higher than during postnatal life in males or prior to puberty and during diestrus in females (53).