Log in

Relevant bibliographies by topics / Preovulatory period / Journal articles

To see the other types of publications on this topic, follow the link: Preovulatory period.

Journal articles on the topic 'Preovulatory period'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Preovulatory period.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Souza, Suelen Pamato Gonçalves, Marceli Vieira Martins, Gustavo Otoboni Molina, Jefferson Ricardo Pereira, Marcelo Tomás Oliveira, and Janaina Salomon Ghizoni. "INFLUENCE OF HORMONAL VARIATION ON PERIODONTAL TISSUES DURING PREMENSTRUAL AND PREOVULATORY PERIODS." Journal of Research in Dentistry 2, no. 2 (2014): 129. http://dx.doi.org/10.19177/jrd.v2e22014129-37.

Full text

Abstract:

The aim of this work was to evaluate the hormonal influence on periodontal tissues in two moments: premenstrual and preovulatory, in women whose are in the reproductive phase between 18 and 45 years. The sample is composed by 30 women, who were analyzed following the inclusion criteria as: not pregnant women, who are not using contraceptive or other means of hormonal replacement, who were not in the menopause and who did not present systemic diseases. The periodontal exams were accomplished in two periods: premenstrual and preovulatory, when it was verified bleeding on probing (BOP) and probin

APA, Harvard, Vancouver, ISO, and other styles

2

Choi, Hyeonhae, and Jaesook Roh. "Role of Klf4 in the Regulation of Apoptosis and Cell Cycle in Rat Granulosa Cells during the Periovulatory Period." International Journal of Molecular Sciences 20, no. 1 (2018): 87. http://dx.doi.org/10.3390/ijms20010087.

Full text

Abstract:

In the ovary, the luteinizing hormone (LH) surge suppresses the proliferation and induces the luteinization of preovulatory granulosa cells (GCs), which is crucial for the survival of terminally-differentiated GCs. Krüppel-like factor 4 (Klf4) has been shown to play a role in regulating the cell cycle and apoptosis in various cell types. The rapid induction of Klf4 expressions by LH was observed in preovulatory GCs. To evaluate whether Klf4 affects GC proliferation and survival, primary rat GCs were isolated from pregnant mare serum gonadotropin-primed Sprague–Dawley rat ovaries and transfecte

APA, Harvard, Vancouver, ISO, and other styles

3

Wu, Sheng-Hai, Hao-Ping Tang, Hsien-Chi Wang, Li-Jen Chang, Wei-Ming Lee, and Kuan-Sheng Chen. "YEAR-LONG ULTRASONOGRAPHIC OBSERVATION OF FOLLICULAR FEATURES IN CAPTIVE YELLOW-MARGINED BOX TURTLES (CUORA FLAVOMARGINATA) FROM TAIWAN." Taiwan Veterinary Journal 45, no. 04 (2019): 119–28. http://dx.doi.org/10.1142/s1682648519500045.

Full text

Abstract:

Ultrasonography is widely used to examine reproductive systems in chelonians. Previous studies have described how follicular size is associated with the reproductive stages of yellow-margined box turtles (YMBTs), but our understanding of follicular morphology remains limited. This study describes the different ultrasonographic appearances of preovulatory follicles of these turtles in Taiwan. Randomly selected 28 adult captive female turtles were examined under ultrasonography, weekly from November 2012 to November 2013. The females were divided into ovulatory and non-ovulatory groups with equa

APA, Harvard, Vancouver, ISO, and other styles

4

Zhao, Ping, Ananya De, Zeng Hu, et al. "Gonadotropin Stimulation of Ovarian Fractalkine Expression and Fractalkine Augmentation of Progesterone Biosynthesis by Luteinizing Granulosa Cells." Endocrinology 149, no. 6 (2008): 2782–89. http://dx.doi.org/10.1210/en.2007-1662.

Full text

Abstract:

Recent studies indicated that ovarian functions are regulated by diverse paracrine factors induced by the preovulatory increases in circulating LH. Based on DNA microarray analyses and real-time RT-PCR, we found a major increase in the transcript levels of a chemokine fractalkine after human chorionic gonadotropin (hCG) treatment during the preovulatory period in gonadotropin-primed immature mice and rats. Although CX3CR1, the seven-transmembrane receptor for fractalkine, was also found in murine ovaries, its transcripts displayed minimal changes. Using tandem RT-PCR and immunohistochemistry,

APA, Harvard, Vancouver, ISO, and other styles

5

Roa, J., E. Vigo, J. M. Castellano, et al. "Follicle-Stimulating Hormone Responses to Kisspeptin in the Female Rat at the Preovulatory Period: Modulation by Estrogen and Progesterone Receptors." Endocrinology 149, no. 11 (2008): 5783–90. http://dx.doi.org/10.1210/en.2008-0604.

Full text

Abstract:

Ovulation is triggered by the preovulatory surge of gonadotropins that, in rodents, is defined by the concomitant rise in circulating LH and FSH at the afternoon of proestrus (primary surge), followed by persistently elevated FSH levels at early estrus (secondary surge). In recent years, kisspeptins, products of the KiSS-1 gene that act via G protein-coupled receptor 54, have emerged as an essential hypothalamic conduit for the generation of the preovulatory LH surge by conveying positive feedback effects of estradiol onto GnRH neurons, an event that involves not only estradiol-induced transcr

APA, Harvard, Vancouver, ISO, and other styles

6

Benmachiche, Abdelhamid, Sebti Benbouhedja, Abdelali Zoghmar, and Peter Samir Hesjaer Al Humaidan. "The impact of preovulatory versus midluteal serum progesterone level on live birth rates during fresh embryo transfer." PLOS ONE 16, no. 2 (2021): e0246440. http://dx.doi.org/10.1371/journal.pone.0246440.

Full text

Abstract:

Background Conflicting evidence still prevails concerning the effect of preovulatory elevated progesterone (EP4) on reproductive outcomes in fresh embryo transfer (ET). However, few studies have analyzed the effect of EP4 on the likelihood of pregnancy using multivariate regression approach. The potential confounding factors tested in these studies were limited to either patient’s characteristics or to stimulation related parameters. Yet, several studies have shown that postovulatory parameters such as midluteal progesterone (P4) level may be considered as a proxy variable of endometrial recep

APA, Harvard, Vancouver, ISO, and other styles

7

Satué, Katy, Paloma Montesinos, and Ana MuÑoz. "Modulation of the renin–angiotensin–aldosterone system by steroid hormones during the oestrous cycle in mares." Acta Veterinaria Hungarica 68, no. 1 (2020): 79–84. http://dx.doi.org/10.1556/004.2020.00011.

Full text

Abstract:

AbstractIn women and females of different species of laboratory animals, oestrogens stimulate the renin–angiotensin–aldosterone system (RAAS) by increasing tissue and circulating levels of angiotensinogen and renin during the preovulatory period. Progesterone and cortisol compete with aldosterone for mineralocorticoid receptors, which results in increased Na+ reabsorption during the postovulatory period. The purpose of the current research was to analyse the relationship of oestradiol-17β, progesterone and cortisol with RAAS in 23 mares during an oestrous cycle. During the preovulatory period,

APA, Harvard, Vancouver, ISO, and other styles

8

MAHMOOD, TAHIR A., and ALLAN TEMPLETON. "Peritoneal fluid volume and sex steroids in the preovulatory period in mild endometriosis." BJOG: An International Journal of Obstetrics and Gynaecology 98, no. 2 (1991): 179–83. http://dx.doi.org/10.1111/j.1471-0528.1991.tb13365.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Carrasco, R., J. Singh, and G. P. Adams. "135 SHORT-TERM OVARIAN EFFECTS OF UNILATERAL OVARIECTOMY IN COWS." Reproduction, Fertility and Development 28, no. 2 (2016): 197. http://dx.doi.org/10.1071/rdv28n2ab135.

Full text

Abstract:

Classical studies established that the removal of one of the paired organs produces a compensatory effect on the remaining organ. In the bovine ovary this aspect has not been examined in detail. We took advantage of follicular and luteal profiles from a previous study to retrospectively examine the effects of ovariectomy before and after ovulation on follicular dynamics of the remaining ovary in cattle. To characterise the prevalence and distribution of tyrosine kinase receptor A in the bovine ovary, the original design involved unilateral ovariectomy of cows at different stages of the periovu

APA, Harvard, Vancouver, ISO, and other styles

10

Zaghari, M., R. Taherkhani, and S. Honarbakhsh. "Effects of chronic progesterone injection on performance, plasma hormones and ovarian morphology of feed-satiated and fed restricted broiler breeder hens." Proceedings of the British Society of Animal Science 2009 (April 2009): 204. http://dx.doi.org/10.1017/s175275620003043x.

Full text

Abstract:

Single injection of chronic dose of P4 in laying hens during the preovulatory open period has been shown to have positive effects on inducing a preovulatory LH surge and ovulation (Johnson et al., 1985). However, chronic injection of P4 has been shown to increase baseline concentrations of P4 and result in arrested laying and disrupted distribution of hierarchical follicles in turkeys (Bacon and Liu, 2004). The current study was designed to examine the effects of a simulated progesterone surge (by injection of chronic dose of P4) on broiler breeder hens performance, ovary morphology, plasma me

APA, Harvard, Vancouver, ISO, and other styles

11

Wallace, J. M., R. P. Aitken, and M. A. Cheyne. "The effect of excess rumen degradable protein during the pre, peri or post-ovulatory period on conception rate and conceptus interferon secretion in naturally cycling ewes." Proceedings of the British Society of Animal Science 1996 (March 1996): 181. http://dx.doi.org/10.1017/s0308229600031470.

Full text

Abstract:

Low conception rates in high producing dairy cows have been linked to the feeding of excessive quantities of rumen degradable protein (Elrod & Butler, 1993). Similarly, a recent study in non-lactating ewes, superovulated during seasonal anoestrous, has shown that high rumen degradable protein intakes throughout the preovulatory and early pregnancy period have an adverse effect on embryo survival (Bishonga et al., 1994). The present study aimed to identify the window of oocyte/embryo development which is sensitive to variations in the degradability of maternal protein intake in naturally cy

APA, Harvard, Vancouver, ISO, and other styles

12

Zheng, Cuihong, Thippeswamy Gulappa, Bindu Menon, and K. M. J. Menon. "Association between LH receptor regulation and ovarian hyperstimulation syndrome in a rodent model." Reproduction 160, no. 2 (2020): 239–45. http://dx.doi.org/10.1530/rep-20-0058.

Full text

Abstract:

Ovarian hyperstimulation syndrome (OHSS) is a common complication of ovarian stimulation associated with the administration of human chorionic gonadotropin (hCG) during assisted reproduction. We have determined the expression of luteinizing hormone receptor (Lhcgr) mRNA, vascular endothelial growth factor (VEGF), and its transcription factor, HIF1α, during the periovulatory period in a rodent model of OHSS and compared these results with normal ovulatory periods. These results showed that the downregulation of Lhcgr mRNA in response to conditions that mimic preovulatory LH surge was significan

APA, Harvard, Vancouver, ISO, and other styles

13

Khan, M. I. R., F. C. F. Dias, M. A. Sirard, G. P. Adams, and J. Singh. "194 EFFECT OF MATERNAL AGE ON THE GRANULOSA CELL TRANSCRIPTOME OF PREOVULATORY FOLLICLES IN CATTLE." Reproduction, Fertility and Development 27, no. 1 (2015): 188. http://dx.doi.org/10.1071/rdv27n1ab194.

Full text

Abstract:

The objective was to determine how maternal age influences the transcriptome of the dominant follicle during the preovulatory period. We tested the hypotheses that delayed ovulation in aged cows is associated with 1) altered gene expression of granulosa cells of the preovulatory follicle and 2) decreased synthesis of progesterone by granulosa cells of the preovulatory follicle. Granulosa cells of preovulatory follicles were obtained 24 h after LH treatment from aged Hereford cows (17.0 ± 2.5 years; n = 6) and their daughters (9.0 ± 0.6 years; n = 6), and compared using bovine specific microarr

APA, Harvard, Vancouver, ISO, and other styles

14

Rasmussen, L. E. L., R. Sukumar, and V. Krishnamurthy. "Behavioural and chemical confirmation of the preovulatory pheromone, (Z)-7-dodecenyl acetate, in wild Asian elephants: its relationship to musth." Behaviour 142, no. 3 (2005): 351–96. http://dx.doi.org/10.1163/1568539053778300.

Full text

Abstract:

Mammalian breeding strategies vary depending on particular social contexts and sensory systems emphasized in various species. Among sexually dimorphic non-territorial Asian elephants, Elephas maximus, a multiplex olfactory chemical signaling system has been implicated in ensuring effective reproduction. This study explores how, using chemosensory mechanisms, widely roaming, wild male elephants locate periovulatory females in matriarchal-led female family units and precisely assess their ovulatory status. In this species, the dual obstacles of separately living sexes and infrequent oestrus are

APA, Harvard, Vancouver, ISO, and other styles

15

Mester, Brigitta, Lesley J. Ritter, Janet L. Pitman, et al. "Oocyte expression, secretion and somatic cell interaction of mouse bone morphogenetic protein 15 during the peri-ovulatory period." Reproduction, Fertility and Development 27, no. 5 (2015): 801. http://dx.doi.org/10.1071/rd13336.

Full text

Abstract:

Bone morphogenetic protein 15 (BMP15) is a key intraovarian growth factor regulating mammalian fertility, yet expression and localisation of different BMP15 protein forms within ovarian follicles around the time of the preovulatory LH surge remains unclear. Using immunoblotting and immunocytochemistry, the present study identified that post-translationally processed BMP15 proregion and mature proteins are increasingly expressed and localised with cumulus and granulosa cells from mice treated with pregnant mare’s serum gonadotropin (PMSG) + human chorionic gonadotrophin (hCG). However, this inc

APA, Harvard, Vancouver, ISO, and other styles

16

Armstrong, D. G. "Changes in 3β-hydroxy-Δ5-steroid dehydrogenase activity in granulosa tissue during the ovulatory cycle of the laying hen (Gallus domesticus)". Journal of Endocrinology 106, № 3 (1985): 269–73. http://dx.doi.org/10.1677/joe.0.1060269.

Full text

Abstract:

ABSTRACT The object of this study was to examine changes in the activity of granulosa 3β-hydroxy-Δ5-steroid dehydrogenase during the ovulatory cycle of the domestic fowl. The enzyme activity in granulosa tissue from the largest follicle increased significantly during the period 8–14 h before an expected ovulation. The increase in activity occurs before the preovulatory surge of LH and near the time of lights off. During the 4–8 h period before an ovulation, i.e. the time of maximal plasma LH concentrations, 3β-hydroxy-Δ5-steroid dehydrogenase activity decreased in granulosa tissue from the lar

APA, Harvard, Vancouver, ISO, and other styles

17

Abisogun, A. O. "Modulatory role of eicosanoids in vascular changes during the preovulatory period in the rat." Biology of Reproduction 38, no. 4 (1988): 756–62. http://dx.doi.org/10.1095/biolreprod38.4.756.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Fahiminiya, Somayyeh, Karine Reynaud, Valérie Labas, Séverine Batard, Sylvie Chastant-Maillard, and Nadine Gérard. "Steroid hormones content and proteomic analysis of canine follicular fluid during the preovulatory period." Reproductive Biology and Endocrinology 8, no. 1 (2010): 132. http://dx.doi.org/10.1186/1477-7827-8-132.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Watson, E. D., S.-E. Bae, R. Thomassen, S. R. M. Thomson, K. Woad, and D. G. Armstrong. "Insulin-like growth factors-I and -II and insulin-like growth factor-binding protein-2 in dominant equine follicles during spring transition and the ovulatory season." Reproduction 128, no. 3 (2004): 321–29. http://dx.doi.org/10.1530/rep.1.00100.

Full text

Abstract:

The period between seasonal anoestrus and cyclicity is characterized in many mares by cyclical growth and regression of large dominant follicles. The insulin-like growth factor (IGF) system plays a key role in follicular growth and regression; therefore, we hypothesized that changes in the IGF system and its binding proteins would modulate onset of cyclicity in mares. Ovaries were obtained from pony mares on the day after detection of an actively growing 30 mm transitional anovulatory follicle, and also at the second or third oestrus of the breeding season on the day after the preovulatory fol

APA, Harvard, Vancouver, ISO, and other styles

20

Paradis, Francois, Susan Novak, Gordon K. Murdoch, Michael K. Dyck, Walter T. Dixon, and George R. Foxcroft. "Temporal regulation of BMP2, BMP6, BMP15, GDF9, BMPR1A, BMPR1B, BMPR2 and TGFBR1 mRNA expression in the oocyte, granulosa and theca cells of developing preovulatory follicles in the pig." REPRODUCTION 138, no. 1 (2009): 115–29. http://dx.doi.org/10.1530/rep-08-0538.

Full text

Abstract:

This study aimed to describe the abundance and localization ofBMP2,BMP6,BMP15,GDF9,BMPR1A,BMPR1B,BMPR2andTGFBR1mRNA during pig preovulatory follicular development and to evaluate their implication in improving follicular maturity in the preovulatory period preceding the second versus first post-weaning oestrus. Oocytes, granulosa (GC) and theca cells (TC) were recovered from antral follicles of primiparous sows at day 1, 2 and 4 after weaning and at day 14, 16 and 20 of their subsequent oestrous cycle. Real-time PCR analysis revealed that with the exception ofBMP6mRNA, which was absent in GC,

APA, Harvard, Vancouver, ISO, and other styles

21

Al-Khozam, N. M., J. J. Robinson, T. G. McEvoy, R. P. Aitken, P. A. Findlay, and I. S. Robertson. "Effect of dietary energy concentrations during the peri-ovulatory period on the in vivo and in vitro development of fertilized sheep ova." Proceedings of the British Society of Animal Science 1995 (March 1995): 74. http://dx.doi.org/10.1017/s0308229600028415.

Full text

Abstract:

Results from a series of recent experiments involving superovulated ewes demonstrate the important influence of nutritionally-induced alterations in preovulatory progesterone concentrations on the subsequent in vivo and in vitro development of their fertilized ova (McEvoy et al, 1993 and 1995; Creed et al, 1994). In essence, these show that high-plane feeding can suppress preovulatory progesterone concentrations to such an extent that the subsequent development of the ova is impaired both in vivo and during in vitro culture. An important practical question however remains unanswered in that no

APA, Harvard, Vancouver, ISO, and other styles

22

Belotti, E. M., A. N. Amweg, V. Matiller, et al. "Effects of adrenocorticotrophic hormone on the expression of matrix metalloproteinases and their inhibitors in the bovine ovary." Reproduction, Fertility and Development 32, no. 8 (2020): 748. http://dx.doi.org/10.1071/rd19232.

Full text

Abstract:

Cattle undergo numerous environmental and management stressors that reduce fertility and affect ovulation. The extracellular matrix of the follicle wall can be altered by matrix metalloproteinases (MMPs), the activities of which are regulated by interleukins and tissue-specific inhibitors of metalloproteinases (TIMPs), especially during ovulation. The aims of the present study were to: (1) evaluate changes in the hormone milieu, the localisation and activity of MMP2 and MMP9 and the localisation of MMP14, TIMP1 and TIMP2 in response to adrenocorticotrophic hormone (ACTH) during the preovulator

APA, Harvard, Vancouver, ISO, and other styles

23

Chyb, J., M. Socha, P. Szczerbik, M. Sokolowska-Mikolajczyk, T. Mikołajczyk, and P. Epler. "The influence of sGnRH-A and antidopaminergic drug – pimozide – on prolactin mRNA synthesis in female Prussian carp (Carassius gibelio Bloch) in vivo." Czech Journal of Animal Science 58, No. 1 (2013): 31–36. http://dx.doi.org/10.17221/6523-cjas.

Full text

Abstract:

Effects of salmon gonadotropin releasing hormone analogue (sGnRH-A) and antidopaminergic drug, pimozide, on the synthesis of prolactin mRNA in vivo in female Prussian carp (Carassius gibelio Bloch) during two different stages of the reproductive cycle were evaluated. The results showed that the lowest dose of sGnRH-A (5 &mu;g/kg body weight) significantly stimulated the mRNA synthesis in fish during the recrudescence as well as during the preovulatory period, higher doses of this compound having no significant effect on prolactin mRNA synthesis. The blocker of dopamine receptors, pimozide,

APA, Harvard, Vancouver, ISO, and other styles

24

Henderson, K. M., L. C. Savage, R. L. Ellen, K. Ball, and K. P. McNatty. "Consequences of increasing or decreasing plasma FSH concentrations during the preovulatory period in Romney ewes." Reproduction 84, no. 1 (1988): 187–96. http://dx.doi.org/10.1530/jrf.0.0840187.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Rabahi, Flora, Danielle Monniaux, Claudine Pisselet, Daniel Chupin, and Philippe Durand. "Qualitative and quantitative changes in protein sythesis of bovine follicular cells during the preovulatory period." Molecular Reproduction and Development 30, no. 3 (1991): 265–74. http://dx.doi.org/10.1002/mrd.1080300315.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Thomas, GB, GB Martin, JR Ford, PM Moore, BK Campbell, and DR Lindsay. "Secretion of LH, FSH and Oestradiol-17ß During the Follicular Phase of the Oestrous Cycle in the Ewe." Australian Journal of Biological Sciences 41, no. 3 (1988): 303. http://dx.doi.org/10.1071/bi9880303.

Full text

Abstract:

Plasma concentrations of LH, FSH and oestradiol-17iJ were measured in blood samples taken at 15 min intervals for 48 h during the follicular phase of four Merino ewes. The amplitude of pulses of LH and the mean concentration of LH were higher at the beginning of the follicular phase, 36-24 h before the preovulatory surge of LH (amplitude 2�4 ng ml- 1, mean concentration 3�9 ng ml- 1), than at the end, 24-0 h before the preovulatory surge (amplitude 1� 2 � 0�1 ng ml- 1; mean concentration 1�4 � 0�1 ng ml- 1). There was no change in the inter-pulse interval during this time (mean 74 � 5 min). Ov

APA, Harvard, Vancouver, ISO, and other styles

27

Kadokawa, H., D. Blache, Y. Yamada, and G. B. Martin. "Relationships between changes in plasma concentrations of leptin before and after parturition and the timing of first post-partum ovulation in high-producing Holstein dairy cows." Reproduction, Fertility and Development 12, no. 8 (2000): 405. http://dx.doi.org/10.1071/rd01001.

Full text

Abstract:

During early lactation, dairy cattle are in negative energy balance and the delay to first post-partum ovulation depends on the time taken to recover from this situation. Lactating cows rely heavily on body fat to meet their requirements, leading to the suggestion that leptin, a hormone secreted mainly by adipocytes, is acting as a metabolic signal to sites that control the reproductive axis. The relationship between plasma leptin concentrations and the timing of the first ovulation post partum in 20 high-producing Holstein dairy cows, using a radioimmunoassay based on recombinant bovine lepti

APA, Harvard, Vancouver, ISO, and other styles

28

Park, Jae-Il, Hye-Jeong Jeon, Nak-Kyun Jung, et al. "Periovulatory Expression of Hydrogen Peroxide-Induced Sulfiredoxin and Peroxiredoxin 2 in the Rat Ovary: Gonadotropin Regulation and Potential Modification." Endocrinology 153, no. 11 (2012): 5512–21. http://dx.doi.org/10.1210/en.2012-1414.

Full text

Abstract:

Abstract Reactive oxygen species are involved in ovulation. The aim of this study was to examine gonadotropin regulation of antioxidant enzyme sulfiredoxin (Srx) and peroxiredoxin 2 (PRDX2) expressions and modification during the ovulatory process in rats. Administration of antioxidants in vivo reduced ovulation rate and cumulus expansion. LH treatment increased H2O2 levels within 15 min, which, in turn, induced Srx gene expression in cultured preovulatory follicles. Treatment of preovulatory follicles with catalase suppressed the stimulatory effect of LH on Akt phosphorylation. LH- or H2O2-st

APA, Harvard, Vancouver, ISO, and other styles

29

Ginther, O. J., M. O. Gastal, E. L. Gastal, J. C. Jacob, M. A. R. Siddiqui, and M. A. Beg. "Effects of age on follicle and hormone dynamics during the oestrous cycle in mares." Reproduction, Fertility and Development 20, no. 8 (2008): 955. http://dx.doi.org/10.1071/rd08121.

Full text

Abstract:

The effects of age (young: 5–6 years; intermediate: 10–14 years; old: ≥18 years) on follicle and hormone dynamics during an interovulatory interval (IOI; n = 46) and on preovulatory oocytes and concentrations of follicular fluid factors (n = 44) were studied in mares. Old mares were not approaching senescence, as indicated by regular lengths of the IOI (19–27 days) during the period May–October. The IOI was 1 day longer (P < 0.05) in the old group than in the two younger groups and was associated with a slower (P < 0.05) growth rate of the ovulatory follicle. The old group had diminished

APA, Harvard, Vancouver, ISO, and other styles

30

Arai, Koji Y., Hisashi Kishi, Satoshi Onodera, et al. "Cyclic changes in messenger RNAs encoding inhibin/activin subunits in the ovary of the golden hamster (Mesocricetus auratus)." Journal of Endocrinology 185, no. 3 (2005): 561–75. http://dx.doi.org/10.1677/joe.1.06140.

Full text

Abstract:

To elucidate changing patterns of inhibin/activin subunit mRNAs in the ovary of the golden hamster (Mesocricetus auratus) during the oestrous cycle, inhibin/activin subunit cDNAs of this species were cloned and ribonuclease protection assay and in situ hybridization were carried out. Inhibin α-subunit mRNA was localized in granulosa cells of primary, secondary, tertiary and atretic follicles throughout the 4-day oestrous cycle. It was also expressed in luteal cells on days 1 (oestrus), 2 (metoestrus) and 3 (dioestrus). βA-subunit mRNA was localized in granulosa cells of large secondary (>20

APA, Harvard, Vancouver, ISO, and other styles

31

Legan, Sandra J., Kathleen M. Donoghue, Kathleen M. Franklin, and Marilyn J. Duncan. "Phenobarbital blockade of the preovulatory luteinizing hormone surge: association with phase-advanced circadian clock and altered suprachiasmatic nucleus Period1 gene expression." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 296, no. 5 (2009): R1620—R1630. http://dx.doi.org/10.1152/ajpregu.90914.2008.

Full text

Abstract:

The suprachiasmatic nucleus (SCN) controls the timing of the preovulatory luteinizing hormone (LH) surge in laboratory rodents. Barbiturate administration during a critical period on proestrus delays the surge and prolongs the estrous cycle 1 day. Because a nonphotic timing signal (zeitgeber) during the critical period that phase advances activity rhythms can also induce the latter effect, we hypothesized that barbiturates delay the LH surge by phase-advancing its circadian timing signal beyond the critical period. In experiment 1, locomotor rhythms and estrous cycles were monitored in hamster

APA, Harvard, Vancouver, ISO, and other styles

32

Medina, Marcela Fátima, Inés Ramos, Claudia A. Crespo, Susana Cisint, Lucrecia Iruzubieta Villagra, and Silvia Nélida Fernández. "Ultrastructure of the oviductal mucosa of Leptodactylus chaquensis. Analysis of the preovulatory and postovulatory periods." Zygote 23, no. 5 (2014): 635–43. http://dx.doi.org/10.1017/s0967199414000227.

Full text

Abstract:

SummaryIn the present study we analysed the ultrastructural characteristics of the oviductal mucosa of Leptodactylus chaquensis during the preovulatory period and immediately after ovulation. Epithelial secretory cells, ciliated cells, basal cells and glandular secretory cells are described. During the preovulatory period, the oviduct exhibits its maximum degree of development at both the epithelial and the glandular levels, with numerous secretory cells that contain a large number of secretory granules whose contents are released into the oviductal lumen by apocrine and exocytotic secretory p

APA, Harvard, Vancouver, ISO, and other styles

33

RAWLINGS, N. C., I. A. JEFFCOATE, W. D. CURRIE, and S. J. COOK. "CONTROL OF THE SURGE RELEASE OF LH AND FSH IN ESTRADIOL- AND PROGESTERONE-TREATED OVARIECTOMIZED EWES." Canadian Journal of Animal Science 68, no. 4 (1988): 1089–96. http://dx.doi.org/10.4141/cjas88-124.

Full text

Abstract:

Ovariectomized ewes were treated with silastic rubber implants releasing constant amounts of estradiol. During this time the ewes were treated with progesterone-releasing implants for 8–12 d, followed by a 5-d rest period and a second period of progesterone exposure of approximately 12 d duration. Following the first exposure to progesterone all ewes experienced a transient, but large release of LH and FSH from the pituitary, resembling that seen in intact ewes prior to ovulation (the so called preovulatory LH and FSH surges), but with amplitudes in the lower end of the range for the preovulat

APA, Harvard, Vancouver, ISO, and other styles

34

Yadav, D., D. Jhamb, S. S. Nirwan, and M. Gaur. "86 Ultrasonographic evaluation of preovulatory follicle and endometrial echo texture for ovulation prediction in Marwari mares." Reproduction, Fertility and Development 33, no. 2 (2021): 151. http://dx.doi.org/10.1071/rdv33n2ab86.

Full text

Abstract:

The objective of the present study was to evaluate the application of ultrasonographic changes in the preovulatory follicle and uterus for ovulation prediction in Marwari mares. Mares (n=20) were teased daily by a teaser pony and, from the day of first detected oestrus, the ovaries and uterus were examined by transrectal ultrasonography using Exago ECM ultrasound equipped with linear rectal probe (10MHz) until ovulation. Recorded data were analysed by one-way ANOVA and correlation coefficients. The duration of the oestrus period ranged from 5 to 7 days in all mares, with an average of 6.35±0.1

APA, Harvard, Vancouver, ISO, and other styles

35

Yadav, D., D. Jhamb, S. S. Nirwan, and M. Gaur. "86 Ultrasonographic evaluation of preovulatory follicle and endometrial echo texture for ovulation prediction in Marwari mares." Reproduction, Fertility and Development 33, no. 2 (2021): 151. http://dx.doi.org/10.1071/rdv33n2ab86.

Full text

Abstract:

The objective of the present study was to evaluate the application of ultrasonographic changes in the preovulatory follicle and uterus for ovulation prediction in Marwari mares. Mares (n=20) were teased daily by a teaser pony and, from the day of first detected oestrus, the ovaries and uterus were examined by transrectal ultrasonography using Exago ECM ultrasound equipped with linear rectal probe (10MHz) until ovulation. Recorded data were analysed by one-way ANOVA and correlation coefficients. The duration of the oestrus period ranged from 5 to 7 days in all mares, with an average of 6.35±0.1

APA, Harvard, Vancouver, ISO, and other styles

36

Driancourt, M. A., H. Quesnel, G. Meduri, A. Prunier, and D. Hermier. "Luteinization and proteolysis in ovarian follicles of Meishan and Large White gilts during the preovulatory period." Reproduction 114, no. 2 (1998): 287–97. http://dx.doi.org/10.1530/jrf.0.1140287.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Ayrout, Mohsen, Florian Le Billan, Valérie Grange-Messent, Sakina Mhaouty-Kodja, Marc Lombès, and Stéphanie Chauvin. "Glucocorticoids stimulate hypothalamic dynorphin expression accounting for stress-induced impairment of GnRH secretion during preovulatory period." Psychoneuroendocrinology 99 (January 2019): 47–56. http://dx.doi.org/10.1016/j.psyneuen.2018.08.034.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Liu, H. K., D. W. Long, and W. L. Bacon. "Interval Between Preovulatory Surges of Luteinizing Hormone Increases Late in the Reproductive Period in Turkey Hens1." Biology of Reproduction 66, no. 4 (2002): 1068–75. http://dx.doi.org/10.1095/biolreprod66.4.1068.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Faillace, L. S., and M. G. Hunter. "Follicle development and oocyte maturation during the immediate preovulatory period in Meishan and white hybrid gilts." Reproduction 101, no. 3 (1994): 571–76. http://dx.doi.org/10.1530/jrf.0.1010571.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Wood, S. C., R. G. Glencross, E. C. L. Bleach, R. Lovell, A. J. Beard, and P. G. Knight. "The ability of steroid-free bovine follicular fluid to suppress FSH secretion and delay ovulation persists in heifers actively immunized against inhibin." Journal of Endocrinology 136, no. 1 (1993): 137–48. http://dx.doi.org/10.1677/joe.0.1360137.

Full text

Abstract:

ABSTRACT Previous reports indicate that administration of steroid-free bovine follicular fluid (bFF) to intact heifers suppresses plasma FSH levels and delays the timing of ovulation. In addition, cessation of bFF treatment is associated with a rebound hypersecretion of FSH. To test the hypothesis that these effects of bFF are mediated by inhibin, we have compared the responses to bFF treatment in heifers actively immunized against the N-terminal sequence of inhibin α subunit bIα(1–29)Tyr30-ovalbumin) with those in ovalbumin-immunized controls. Oestrous cycles were synchronized, and inhibin-im

APA, Harvard, Vancouver, ISO, and other styles

41

Siqueira, Lucas C., Joabel T. dos Santos, Rogério Ferreira, et al. "Preovulatory changes in the angiotensin II system in bovine follicles." Reproduction, Fertility and Development 25, no. 3 (2013): 539. http://dx.doi.org/10.1071/rd11316.

Full text

Abstract:

The present study evaluated whether the gonadotrophin surge modulates components of the renin–angiotensin system and whether angiotensin II (Ang II) plays a role in the production of hormones by follicular cells during the ovulatory process. In Experiment 1, cows were ovariectomised at various times (0, 3, 6, 12 and 24h) after GnRH injection to obtain preovulatory follicles. The concentration of Ang II in follicular fluid increased after GnRH and reached a peak at 24h, concomitant with the peak of angiotensinogen (AGT) mRNA expression in granulosa cells. AGT mRNA was not expressed in theca cel

APA, Harvard, Vancouver, ISO, and other styles

42

Coyne, Mary D., Christina M. Kesick, Tammy J. Doherty, Margaret A. Kolka, and Lou A. Stephenson. "Circadian rhythm changes in core temperature over the menstrual cycle: method for noninvasive monitoring." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 279, no. 4 (2000): R1316—R1320. http://dx.doi.org/10.1152/ajpregu.2000.279.4.r1316.

Full text

Abstract:

The purpose of this study was to determine whether core temperature (Tc) telemetry could be used in ambulatory women to track changes in the circadian Tc rhythm during different phases of the menstrual cycle and, more specifically, to detect impending ovulation. Tcwas measured in four women who ingested a series of disposable temperature sensors. Data were collected each minute for 2–7 days and analyzed in 36-h segments by automated cosinor analysis to determine the mesor (mean temperature), amplitude, period, acrophase (time of peak temperature), and predicted circadian minimum core temperatu

APA, Harvard, Vancouver, ISO, and other styles

43

Warma, Aly, Marianne Descarreaux, Younes Chorfi, Raynald Dupras, Roxane Rémillard, and Kalidou Ndiaye. "Interleukins’ expression profile changes in granulosa cells of preovulatory follicles during the postpartum period in dairy cows." Cytokine: X 2, no. 1 (2020): 100022. http://dx.doi.org/10.1016/j.cytox.2020.100022.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Gastal, E. L., M. O. Gastal, and O. J. Ginther. "Relationships of changes in B-mode echotexture and colour-Doppler signals in the wall of the preovulatory follicle to changes in systemic oestradiol concentrations and the effects of human chorionic gonadotrophin in mares." Reproduction 131, no. 4 (2006): 699–709. http://dx.doi.org/10.1530/rep.1.01011.

Full text

Abstract:

A duplex grey-scale and colour-Doppler ultrasound instrument was used to study the changes in the wall of the preovulatory follicle in mares. When the follicle reached ≥35 mm (hour 0), mares were randomized into control (n= 16) and human chorionic gonadotropin (hCG)-treated (n= 16) groups. The hCG treatment was given at hour 0. Scanning was done every 12 h until hour 36, every hour between hours 36 and 48, and every 12 h thereafter until ovulation. Blood was sampled every 12 h for oestradiol assay. During the period 0–24 h post-treatment, oestradiol concentrations decreased in the hCG group an

APA, Harvard, Vancouver, ISO, and other styles

45

Martelli, A., P. Berardinelli, V. Russo, et al. "Spatio-temporal analysis of vascular endothelial growth factor expression and blood vessel remodelling in pig ovarian follicles during the periovulatory period." Journal of Molecular Endocrinology 36, no. 1 (2006): 107–19. http://dx.doi.org/10.1677/jme.1.01921.

Full text

Abstract:

Vascular endothelial growth factor (VEGF) expression pattern and blood vessel remodelling were evaluated during the transition from the preovulatory follicle to the corpus luteum (CL). To this end, prepubertal gilts were treated with equine chorionic gonadotrophin (eCG) to collect preovulatory follicles (60 h after eCG) and with human chorionic gonadotrophin (hCG) to obtain periovulatory follicles 18 h and 36 h later. The VEGF mRNA content was analysed by in situ hybridization, while protein localization in follicular fluid (FF) and in granulosa and theca compartments was evaluated by ELISA, i

APA, Harvard, Vancouver, ISO, and other styles

46

Kersey, David C., David E. Wildt, Janine L. Brown, Rebecca J. Snyder, Yan Huang, and Steven L. Monfort. "Endocrine milieu of perioestrus in the giant panda (Ailuropoda melanoleuca), as determined by non-invasive hormone measures." Reproduction, Fertility and Development 22, no. 6 (2010): 901. http://dx.doi.org/10.1071/rd09178.

Full text

Abstract:

The aim of the present study was to determine the efficacy of faecal hormonal measures for evaluating ovarian activity in a significant sized cohort of giant pandas during the perioestrual period. Faecal excretion of oestrogen and progestagen metabolites corresponded with urinary patterns and receptive behaviours. Longitudinal assessment of 10 females revealed that, on average, faecal oestrogen concentrations started to rise (P < 0.05) above baseline (baseline mean ± s.e.m.; 64.7 ± 6.6 ng g−1) 5 days before the preovulatory oestrogen peak (484.6 ± 126.8 ng g−1), which was followed by a grad

APA, Harvard, Vancouver, ISO, and other styles

47

Wischral, A., K. T. Haag, G. R. Fonseca, M. O. Gastal, S. S. King, and E. L. Gastal. "124 RELATIONSHIPS BETWEEN PREOVULATORY FOLLICLE AND CORPUS LUTEUM BLOOD FLOW IN MARES." Reproduction, Fertility and Development 24, no. 1 (2012): 174. http://dx.doi.org/10.1071/rdv24n1ab124.

Full text

Abstract:

Colour- and power-Doppler ultrasonography have recently been used as potential new technologies to assess the degree of vascular perfusion of the ovary and follicles for research and clinical studies of ovarian and follicle hemodynamics and to predict fertility in horses, cattle and humans. In the present study, the following hypotheses were tested: (1) preovulatory follicle (POF) diameter (≥30 mm), but not blood flow, is repeatable between cycles within the same mare; (2) POF diameter and blood flow are good indicators of follicle status; (3) double POF have similar blood flow; and (4) highly

APA, Harvard, Vancouver, ISO, and other styles

48

Vernunft, A., JM Weitzel, and T. Viergutz. "Corpus luteum development and its morphology after aspiration of a preovulatory follicle is related to size and steroid content of the follicle in dairy cows." Veterinární Medicína 58, No. 4 (2013): 221–29. http://dx.doi.org/10.17221/6760-vetmed.

Full text

Abstract:

Secretion of adequate levels of progesterone from a proper corpus luteum (CL), which develops out of the cells of a healthy preovulatory follicle, is a key-factor for establishment of a pregnancy. The aim of this study was to investigate the relationship between morphological and secretory characteristics of preovulatory follicles and their corresponding corpus luteum with regard to the post-partum period in high-yielding dairy cows. Therefore, ultrasound-guided aspirations of preovulatory follicles were performed repeatedly, using 20 first lactating cows between 26 and 121 days after parturit

APA, Harvard, Vancouver, ISO, and other styles

49

Gaytan, F., C. Morales, C. Bellido, et al. "Progesterone on an oestrogen background enhances prolactin-induced apoptosis in regressing corpora lutea in the cyclic rat: possible involvement of luteal endothelial cell progesterone receptors." Journal of Endocrinology 165, no. 3 (2000): 715–24. http://dx.doi.org/10.1677/joe.0.1650715.

Full text

Abstract:

Preovulatory surges of both prolactin (PRL) and progesterone have been suggested to be necessary for the induction of apoptosis in the regressing corpus luteum of the cyclic rat. The aim of these experiments was to study whether the administration of PRL and/or progesterone on the morning of pro-oestrus reproduces the regressive changes that happen in the cyclic corpus luteum (CL) during the transition from pro-oestrus to oestrus, and to analyse the temporal relationships between two characteristic features of structural luteolysis (luteal cell apoptosis and accumulation of macrophages). Cycli

APA, Harvard, Vancouver, ISO, and other styles

50

Satué, K., P. Montesinos, and J. C. Gardon. "65 ASSOCIATION BETWEEN ALDOSTERONE AND CORTISOL LEVELS DURING THE OVULATORY PERIOD IN SPANISH PUREBRED MARES." Reproduction, Fertility and Development 26, no. 1 (2014): 146. http://dx.doi.org/10.1071/rdv26n1ab65.

Full text

Abstract:

Preovulatory increased aldosterone (ALD) has been described as one of the physiological events that characterise the oestrous cycle in relation to the dynamics of the renin angiotensin aldosterone system. Within the mechanisms associated with this response are the stimulating effect of oestrogen on the synthesis of angiotensinogen, haemodynamic variations of renal blood flow, changes in sodium concentration, changes in the local sympathetic activity, and the effect of cortisol (CORT). In fact, CORT via adrenocorticotropic hormone contributes primarily to preovulatory ALD, and it is the primary

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!