Endometrial prostaglandins (PGs) and the PGE2/PGF2alpha ratio play an important role in regulating the estrous cycle and establishment of pregnancy. The enzymes downstream of cyclooxygenase-2 may determine the PGE2/PGF2alpha ratio in the porcine uterus. Thus, we have cloned porcine PGF synthase (PGFS) and microsomal PGE synthase-1 (mPGES-1) and characterized their expression in porcine endometr...

Multi- and single-unit recording was performed in the gracile nucleus in urethane-anesthetized rats to examine estrous variations in responses of its neurons to brushing the hindquarters and mechanical stimulation of the uterus, vaginal canal, cervix, and colon. Six rats each were studied in each of the four estrous stages: proestrus (P), estrus (E), metestrus (M), and diestrus (D). The magnitu...

Investigations on the optimum timing of artificial insemination (AI) following automated activity monitoring (AAM) depending different types semen in heifers are limited and part show controversial results. Therefore, objective this observational study was to determine association between AI using characteristics estrus (i.e., onset, peak, end estrus) pregnancy per (P/AI) Holstein heifers. Heif...

Carbofuran, a systemic N-methyl carbamate pesticide was orally administered with the doses of 0.4, 0.7, 1 and 1.3 mg/kg body weight/day to normal virgin female Swiss albino mice for 30 days. The vaginal smear and body weight of mice were recorded daily and mice were sacrificed on the 31st day. Estrous cycle was effected by showing a significant decrease in the number of estrous cycle and the du...

Brahman (Bos indicus) cows, were selected at 28+/-10 days after calving and analyzed by real time rectal ultrasonography three times a week, in order to evaluate and compare follicular and corpus luteum development during postpartum (PP) anestrus and the first PP estrous cycle under sylvopastoril conditions. Suckling (S, n=11) or non-suckling (NS, n=5) cows were evaluated in a zone of tropical ...

This study compared the responses shown by lactating dairy cows to four different P4-based protocols for AI at estrus. Cows with no estrous signs 96 h after progesterone intravaginal device (PRID) removal were subjected to fixed-time AI (FTAI), and their data were also included in the study. In Experiment I, follicular/luteal and endometrial dynamics were assessed every 12 h from the beginning ...

Experiments were designed to test the hypothesis that LHRH receptors in the preoptic area (POA) are of physiological importance for maintaining estrous cyclicity in the rat. Bilateral cannulae were implanted just dorsal to the POA. Estrous cycles were monitored daily by vaginal smears. Antide, a long-acting LHRH antagonist, was infused bilaterally (2.5 micrograms/side) in the POA or the hypotha...

Ovariectomy of (C57 X NH) F1 mice resulted in estrogen-secreting adrenal adenomas and estrous-type vaginal smears. Parabiosis with intact (C57 X NH) F1 females usually converted the vaginal smears from estrous to diestrous but produced a constant-estrous type smear in the intact parabiont. Ovariectomy of the latter resulted usually in restoration of an estrous-type smear in the tumorous animal ...

Aim: Present study was undertaken to investigate profiling of prostaglandin F receptor (PGFR) mRNA expression during estrous cycle and early pregnancy. Materials and Methods: Female genitalia of goats (n=3) were collected from a local abattoir. Based on color, vasculature, size, and consistency of corpus luteum (CL), the uteri were classified into three stages of the estrous cycle: stage I: Day...

The aim of the present study was to investigate the distribution and density of noradrenergic nerve fibres (NNFs), content of catecholamines (CATs) and steroids in the cystic ovaries of gilts receiving DXM from middle luteal phase. Cystic status of ovaries was induced by i.m. DXM injections on days 7-21 of the estrous cycle. During the same time, gilts in the control group received saline. The ...